These are scripts installed on a server. Only server operators need to download them, players do not need to download these. If you want to learn how to make scripts, make missions or make voice packs - look under Legends Modding in the menu on the left.
Compatibility varies. New Gametypes for any mod or default Legends, 3-way CTF, racing, king-of-the-hill, siege etc.
Compatibility varies. Changes to the whole game, total conversions, physics, loadouts, vehicles etc. Not admin mods, not client packs.
Compatibility varies. New admin plugins, mission rotation, remote management, tournament scripts, team management etc.
Not compatible with latest version, fix these!