Browse free open source Internet software and projects for Windows and Linux below. Use the toggles on the left to filter open source Internet software by OS, license, language, programming language, and project status.

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  • 1
    KeePass

    KeePass

    A lightweight and easy-to-use password manager

    KeePass Password Safe is a free, open source, lightweight, and easy-to-use password manager for Windows, Linux and Mac OS X, with ports for Android, iPhone/iPad and other mobile devices. With so many passwords to remember and the need to vary passwords to protect your valuable data, it’s nice to have KeePass to manage your passwords in a secure way. KeePass puts all your passwords in a highly encrypted database and locks them with one master key or a key file. As a result, you only have to remember one single master password or select the key file to unlock the whole database. And the databases are encrypted using the best and most secure encryption algorithms currently known, AES and Twofish. See our features page for details.
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    Downloads: 330,153 This Week
    Last Update:
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  • 2
    XAMPP

    XAMPP

    An easy to install Apache distribution containing MySQL, PHP, and Perl

    XAMPP is a very easy to install Apache Distribution for Linux, Solaris, Windows, and Mac OS X. The package includes the Apache web server, MySQL, PHP, Perl, a FTP server and phpMyAdmin.
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    Downloads: 301,864 This Week
    Last Update:
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  • 3
    Zero Install
    Zero Install is a decentralised cross-distribution software installation system. Create one package that works everywhere! With dependency handling and automatic updates, full support for shared libraries, and integration with native package managers
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    Downloads: 49,977 This Week
    Last Update:
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  • 4
    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server

    Anti-Spam SMTP Proxy Server implements multiple spam filters

    The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 24261. A linux(ubuntu 20.04 LTS) and a freeBSD 12.2 based ready to run OVA of ASSP V2 are also available for download. NOTICE: V1 development has been stopped at the end of 2014 (1.10.1 build 16060). Possibly there will be done some bugfixing in future. Please upgrade to V2, which is and will be actively maintained.
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    Downloads: 50,433 This Week
    Last Update:
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    Fully Managed MySQL, PostgreSQL, and SQL Server

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  • 5
    GeoServer
    GeoServer is an open source software server written in Java that allows users to share and edit geospatial data. Designed for interoperability, it publishes data from any major spatial data source using open standards: WMS, WFS, WCS, WPS and REST
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    Downloads: 44,922 This Week
    Last Update:
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  • 6
    Tcl

    Tcl

    The Tool Command Language implementation

    Tool Command Language (Tcl) is an interpreted language and very portable interpreter for that language. Tcl is embeddable and extensible, and has been widely used since its creation in 1988 by John Ousterhout. Bug reports to http://core.tcl.tk/tcl/ Follow code development at http://core.tcl.tk/tcl/
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    Downloads: 21,687 This Week
    Last Update:
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  • 7
    net-snmp
    Net-SNMP provides tools and libraries relating to the Simple Network Management Protocol including: An extensible agent, an SNMP library, tools to request or set information from SNMP agents, tools to generate and handle SNMP traps, etc.
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    Downloads: 20,950 This Week
    Last Update:
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  • 8
    Amnezia VPN

    Amnezia VPN

    Amnezia VPN Client (Desktop+Mobile)

    Amnezia is an open-source VPN client, with a key feature that enables you to deploy your own VPN server on your server.
    Downloads: 4,309 This Week
    Last Update:
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  • 9
    Double Commander
    Double Commander is a cross platform open source file manager with two panels side by side. It is inspired by Total Commander and features some new ideas.
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    Downloads: 6,262 This Week
    Last Update:
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  • 10
    Zapret

    Zapret

    Advanced open source tool for bypassing DPI-based censorship

    Zapret is an open source, cross-platform tool designed to help users bypass and evade Deep Packet Inspection (DPI)-based traffic blocking and censorship systems. Rather than acting as a traditional proxy or VPN, it works by manipulating network packets and traffic streams locally to confuse or disrupt DPI mechanisms used by ISPs and network filters, making it possible to access restricted websites and services without relaying traffic through third-party servers. Zapret implements multiple strategies including desynchronizing DPI inspection, packet modification, and protocol manipulation to make network traffic less recognizable or harder for DPI systems to classify reliably. It supports deployment on a variety of operating systems including traditional Linux systems, embedded devices like routers running OpenWRT, and has partial support for FreeBSD, OpenBSD, macOS, and Windows.
    Downloads: 1,260 This Week
    Last Update:
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  • 11
    Flowseal

    Flowseal

    Bypass regional or ISP-level restrictions on services like Discord

    Flowseal is a community-hosted repository that provides tools and scripts intended to help users bypass regional or ISP-level restrictions on services like Discord and YouTube, commonly blocked in certain countries or networks. It packages configurations and executable scripts (e.g., batch files) that leverage system-level filtering or packet redirection techniques (such as WinDivert or other strategies) to modify network behavior so that traffic destined for these services appears indistinguishable from unrestricted traffic. The project includes ways to install system services, update host rules, and test different strategies for unblocking or rerouting traffic. Because it directly touches network stacks and routing, its usage is typically technical and can require careful configuration to avoid destabilizing network settings.
    Downloads: 1,073 This Week
    Last Update:
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  • 12
    Tor Browser

    Tor Browser

    Browser for using Tor on Windows, Mac OS X or Linux

    Tor Browser enables you to use Tor on Windows, Mac OS X, or Linux without needing to install any software. Tor is a software that bounces your communications around a distributed network of relays run by volunteers. This effectively prevents anyone watching your Internet connection from learning what sites you visit; it prevents the sites you visit from learning your physical location; and allows you access to sites which are blocked. Tor Browser can run off a USB flash drive, comes with a pre-configured web browser to protect your anonymity, and is self-contained (portable).
    Downloads: 891 This Week
    Last Update:
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  • 13
    hiddify-app

    hiddify-app

    Multi-platform auto-proxy client, supporting Sing-box, X-ray, TUIC

    Hiddify is a comprehensive VPN and proxy client designed to facilitate secure internet access and bypass censorship. It supports advanced proxy protocols like V2Ray, Shadowsocks, and Trojan, offering configuration through QR codes, links, and subscription services. Hiddify aims to be user-friendly while also catering to power users with customizable options, making it a popular choice in regions with restricted internet access.
    Downloads: 806 This Week
    Last Update:
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  • 14
    Sherlock

    Sherlock

    Hunt down social media accounts by username across social networks

    Hunt down social media accounts by username across 400+ social networks.
    Downloads: 800 This Week
    Last Update:
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  • 15
    log4cplus

    log4cplus

    Logging Framework for C++

    log4cplus is a simple to use C++ logging API providing thread-safe, flexible, and arbitrarily granular control over log management and configuration. It is modelled after the Java log4j API.
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    Downloads: 4,309 This Week
    Last Update:
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  • 16
    V2Ray Desktop

    V2Ray Desktop

    Elegant cross-platform proxy GUI client that supports Shadowsocks

    We use Clash as the backend proxy, which supports Shadowsocks(R), V2Ray, and Trojan protocols. V2Ray Desktop is a cross-platform GUI client that supports Shadowsocks(R), V2Ray, and Trojan protocols, running on Windows, Linux, and macOS. It is built with Qt 5 and QML 2. Compared to V2Ray, V2Ray Desktop provides more advanced features such as server subscription and latency test. You can easily migrate to V2Ray Desktop from Shadowsocks-Qt5 and V2Ray Core by importing their config files. Some functions (e.g., server subscription) in the prebuilt binary packages require OpenSSL >= 1.1.0. If you are using Ubuntu<=18.04, please install OpenSSL manually. You can refer to Installation Guide in the Wiki page for the detailed information.
    Downloads: 638 This Week
    Last Update:
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  • 17
    JavDB

    JavDB

    javdb official app

    JavDB is an open-source mobile application designed as an official client for browsing and interacting with the JavDB platform, providing users with a streamlined interface for accessing and managing content from the associated database. The project focuses on delivering a dedicated app experience rather than relying on web browsing, allowing for improved navigation, performance, and usability on mobile devices. It includes distribution options through various channels such as direct downloads, third-party installers, and release builds, making it accessible across different user environments. The application is relatively lightweight and centered around providing quick access to indexed content, metadata, and media listings available on the platform. Its development is maintained through a GitHub repository with ongoing releases and updates, indicating active iteration and refinement.
    Downloads: 614 This Week
    Last Update:
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  • 18
    Vuze - Azureus

    Vuze - Azureus

    An extremely powerful and configurable BitTorrent client

    Vuze (formerly Azureus) is an extremely powerful and configurable BitTorrent client. Search and download torrent files. Play, convert and transcode videos and music for playing on many devices such as PSP, TiVo, XBox, PS3, iTunes (iPhone, iPod, Apple TV).
    Leader badge
    Downloads: 2,781 This Week
    Last Update:
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  • 19
    Sing-box

    Sing-box

    The universal proxy platform

    Sing-box is a universal proxy platform written in Go with support for servers and clients across platforms. It handles multiple proxy protocols with advanced routing, supports TUN-based transparent proxying, and offers both CLI and native graphical clients.
    Downloads: 517 This Week
    Last Update:
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  • 20
    Zint Barcode Generator

    Zint Barcode Generator

    A barcode encoding library supporting over 50 symbologies.

    Encodes data into any of the following: Australia Post, Aztec Code & Runes, BC412, Channel, Codabar, Codablock-F, Code 11, Code 128, Code 16K, Code 2 of 5 (incl. IATA, Interleaved, Data Logic, ITF-14, Deutsche Post Leitcode & Identcode), Code 32 (Italian Pharmacode), Code 39, Code 39+, Code 49, Code 93, Code One, DAFT, Data Matrix (incl. DMRE), DotCode, DPD, Dutch Post KIX, EAN, FIM, Flattermarken, Grid Matrix, GS1 DataBar (incl. stacked & GS1 Composite symbols), GS1-128, Han Xin, HIBC, ISBN, Japan Post, Korea Post, LOGMARS, MaxiCode, NVE-18 ( SSCC-18), PDF417 & MicroPDF417, Pharmacode, PLANET, POSTNET, Plessey (MSI & UK), PZN, QR Code, Micro QR & rMQR, Royal Mail RM4SCC & Mailmark, Telepen, Ultracode, UPC-A, UPC-E, UPNQR, UPU S10, USPS Intelligent Mail and VIN. Automated ECI switching to support all Unicode characters and automated FNC1 character insertion in GS1 mode. Save to BMP, EMF, EPS, GIF, PCX, PNG, SVG and TIF. Includes CLI, GUI and API for calling from other applications.
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    Downloads: 2,263 This Week
    Last Update:
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  • 21
    V2Ray

    V2Ray

    V2Ray is a set of tools for building your own private network

    Project V is a set of tools to help you build your own privacy network over internet. The core of Project V, named V2Ray, is responsible for network protocols and communications. It can work alone, as well as combine with other tools.
    Downloads: 485 This Week
    Last Update:
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  • 22
    FileZilla®

    FileZilla®

    A fast cross-platform FTP client

    FileZilla® is a cross-platform FTP, SFTP, and FTPS client with a vast list of features, which supports Windows, Mac OS X, Linux, and more. FileZilla's dynamic tools help you move files between your local machine and your Web site's server effortlessly. For example, Filezilla lets you compare your files with in-directory server files to manage file syncing. You can also tab browse between servers and transfer files to them simultaneously, as well as edit server files on the go. And Filezilla is available in 47 languages worldwide!
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    Downloads: 2,259 This Week
    Last Update:
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  • 23
    DjVu is a web-centric format for distributing documents and images. DjVu was created at AT&T Labs-Research and later sold to LizardTech Inc. DjVuLibre is a GPL implementation of DjVu maintained by the original inventors of DjVu.
    Leader badge
    Downloads: 1,968 This Week
    Last Update:
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  • 24
    Antinat is a flexible SOCKS server and client library for writing proxy-based applications. It supports SOCKS 4, SOCKS 5, authentication, CHAP, XML firewalling, Win32, server chaining, and UDP. It also contains very experimental IPv6 support.
    Downloads: 11,654 This Week
    Last Update:
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  • 25
    Angry IP Scanner

    Angry IP Scanner

    A cross-platform network scanner that is fast and simple to use

    Angry IP scanner is fast and friendly network scanner for Windows, Linux, and Mac. It is very extensible, allowing it to be used for very wide range of purposes, with the primary goal of being useful to network administrators.
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    Downloads: 2,316 This Week
    Last Update:
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