Repo Organization
Repositories regularly get sorted into personal Github organizations for ease of searching.
Personal repositories kept directly under the saltybrackets profile are either very new (and so haven't been sorted yet), or are purely for personal research/education. Do not expect them to be regularly maintained, or even to stick around (as they'll either be moved, made private for archiving, or outright deleted).
SaltyCog: Tools / Mods / Hacks and Hacking
Repositories kept in the SaltyCog organization are generally intended for public consumption because they provide some utility, and most likely to be maintained/updated. These include things like non-game applications, game mods, and general libraries/frameworks.
Primitive Concept: Games and Gamejam Entries
For archiving gamejam entries and game prototypes; individual repos unlikely to be maintained or updated, but new repos get added fairly regularly. Full games I've worked on are either kept private, or belong to other entities.