Below is the list of the software I've bundled together
6502 CPU emulator:
https://github.com/Torlus/6502.js
7 segment display emulator:
https://github.com/gavinlyonsrepo/LED_Segment_Display_Simulator
Assembler:
https://skilldrick.github.io/easy6502/#intro
And here're the projects I've referenced for emulation concepts:
https://github.com/wutka/kim1-emulator
https://obsolescence.wixsite.com/obsolescence/kim-uno-summary-c1uuh
Special thanks to Dominic Bumbaca for never ending assistance and testing