lichess-org / lila

Open source server powering lichess.org, a free, ad-free online chess platform with realtime games, analysis, and tournaments.

evroon / bracket

Selfhosted tournament system

hexlet-codebattle / codebattle

Codebattle - Game for programmers, where you solved algorithmic problems with other players in real time. You can fight with other players in single player mode or join massive tournaments.

OpSafari / hypoarena

Scientific hypothesis-discovery workbench: grounded hypothesis-evidence graphs, synthetic literature with planted causal chains, generate-debate-evolve loops over pluggable offline adapters, Elo tournaments recovering planted skill order, paraphrase dedup, Bayesian evidence accumulation, reproducible reports. NumPy core, CPU-only torch extra.

ClayStan404 / hexproof

Native desktop multiplayer tabletop for Magic: The Gathering. Manual tables, draft/sealed/cube, and connected-hub Swiss tournaments.