Multi-System
PCGen (software) (D&D 3.5, Pathfinder 1e)
HeroLab Classic (software) (Call of Cthulhu 6e/7e, Chronicles of Darkness (aka nWoD), D&D 3.5e, D&D 5e SRD, Mutants and Masterminds 3e, Pathfinder 1e, Shadowrun 4e/5e, Savage Worlds)
HeroLab Online (web) (Pathfinder 2e, Starfinder, Shadowrun)
Daggerheart
Daggerheart SRD Character Creator (web, no login needed)
Duality Codex (web)
Heartsmith (web, no login needed)
Some Redditor's GDrive of form-fillable character sheets: https://drive.google.com/drive/folders/1RwHLjhRWmO4fyFUyMKOvd7LzVKawTEgo
Delta Green
Delta Green Agent Creator (web)
Dungeons and Dragons, 5th edition
D&D Beyond (web & Android, iOS apps)
Pathfinder 1e
Mottokrosh's Eldritch Online Character Sheet (web)
Pathcompanion (web)
Pathfinder 2e
Pathfinder 2e Nexus (web)
Pathbuilder 2e (web & Android apps)
Wanderer's Guide (web)
Savage Worlds
Savaged.us (web)
World of Darkness
Vampire the Masquerade 5e Nexus (web)
Schrecknet (web)
- For Vampire the Masquerade 5e, Werewolf the Apocalypse 5e, and Hunter the Reckoning 5e