It's called vim-visual-multi in analogy with visual-block, but the plugin works mostly from normal mode.

Basic usage:

• select words with Ctrl-N (like Ctrl-d in Sublime Text/VS Code)
• create cursors vertically with Ctrl-Down/Ctrl-Up
• select one character at a time with Shift-Arrows
• press n/N to get next/previous occurrence
• press [/] to select next/previous cursor
• press q to skip current and get next occurrence
• press Q to remove current cursor/selection
• start insert mode with i,a,I,A

Two main modes:

• in cursor mode commands work as they would in normal mode
• in extend mode commands work as they would in visual mode
• press Tab to switch between «cursor» and «extend» mode

Most vim commands work as expected (motions, r to replace characters, ~ to change case, etc). Additionally you can:

• run macros/ex/normal commands at cursors
• align cursors
• transpose selections
• add patterns with regex, or from visual mode

And more... of course, you can enter insert mode and autocomplete will work.

With vim-plug:

Plug 'mg979/vim-visual-multi', {'branch': 'master'}

:help visual-multi

To run the tutorial:

vim -Nu path/to/visual-multi/tutorialrc

The wiki was the first documentation for the plugin, but many pictures are outdated and contain wrong mappings. Still, you can take a look.

You could read at least the Quick Start.

Some (sometimes very old) random pics:

Insert mode with autocomplete, alignment (mappings in pic have changed, don't trust them)

Undo/Redo edits and selections

Alternate cursor/extend mode, motions (even %), reverse direction (as in visual mode) and extend from the back. At any time you can switch from extend to cursor mode and viceversa.

Select inside/around brackets/quotes/etc:

Select operator, here shown with 'wellle/targets.vim' plugin: sib, sia, saa + selection shift

Single region mode in insert mode, Tab moves to the next cursor

Synched column transposition

Unsynched transposition (cycle all regions, also in different lines)

Shift regions left and right (M-S-<>)

Independent anchoring

Find words under cursor, add new words (patterns stack), navigate regions, skip them, add regions with regex.

Normal/Visual/Ex commands at cursors

Macros. Shorter lines are skipped when adding cursors above/below.

Some editing functions: yank, delete, paste from register, paste block from yanked regions

Case conversion