Exercism
signupFree mentored practice in 83 languages, donation-funded
100% free forever, nonprofit. 8,521+ exercises, human mentor review. Matches our donations-only rule perfectly.
| URL | https://exercism.org |
| Tier | signup |
| Relevance | medium |
| Last active signal | Feb 2026 Jiki beginner platform launch |
| Verified alive | yes |
| Category | When stuck |