PAWN scripting improvements (i.e. new language features).
Core libraries, used almost everywhere else.
Data structures and algorithms.
- y_bintree
- y_bit
- y_iterate (AKA y_foreach)
- y_hashmap
- y_jaggedarray
- y_playerarray
- y_playerset
- y_sortedarray
- y_sparsearray
Optional features.
Libraries that provide information about the game.
Libraries for managing players.
Libraries for controlling the server.
- y_colours (AKA y_colors)
- y_flooding
- y_lock
- y_punycode
- y_scriptinit
- y_stringise (AKA y_stringize)
- y_td
Libraries for interacting with persistent data.
Libraries that have in-game visible effects.
No-one actually knows! The original idea was "Y_Less' Server Includes", but "Script" and "Server" were frequently intermixed, and there are more devs than just Y_Less now, so the "Y" just became a recursive acronym for "YSI". There are now several official meanings, each incorporating different aspects of YSI:
Core libraries.
Coding libraries (pawn language extensions).
Game related stuff (commands, properties, text etc).
Extras, like login and commands.
The macros (though in their defense, writing macros to do the parsing within the compiler limitations is VERY hard).
y_tho.