Hey Warft - Awesome list you got there.
Mind adding Stary2001 and myselves vita-lua (https://github.com/Stary2001/vita-lua
It is sort of like LuaPlayer for the PSP: Lua on the PS Vita.
It has a concept of bootscripts, which are basically bundeled lua scripts.
The default bundled script is a small filemanager/file viewer by me.
It's name is VitaFM.
It can be expanded and things. The default bundeled "programs" are a small text viewer, image viewer, a thing to mount zip files to the fs and a lua script runner.
Both Stary2001 and myself are working hard on it, but it still does contain some bugs, so be warned.
There are also no Docs yet, but they will come eventually(tm).
I'll add a build of vita-lua with VitaFM as bootscript soonish.