IT
- BaseWin - Original Windows/Office ISO images [PL]
- Chat.OpenAI [any language]
- Cipher Suite Info [EN] - IANA cipher suite test
- CodeAcademy [EN]
- CodePlex Archive - Open Source Project Archive [EN]
- devdocs.io [EN]
- DistroSea [EN] - test Linux distros online
- DistroWatch [EN]
- Online regex tester and debugger [EN]
- PeeringDB [EN]
- Pouet [EN] - Demoscene
- Programming Notes for Professionals books [EN]
- Regular expressions [EN]
- Regex crossword [EN]
- RegexOne [EN]
- SS64 [EN]
Darmowe serwisy on-line testujące konfigurację serwerów www
- 1&1 Website Checker [EN]
- Comodo SSL Analyzer [EN]
- Digi Cert [EN]
- Qualys SSL Labs [EN]
- Quttera [EN]
- Sitechecker [EN]
- Sucuri [EN]
- SSL Shopper [EN]
- SSL Store [EN]
- SSL Tools [EN]
- UpGuard [EN]
- W3C Link checker [EN]
- Web Inspector [EN]
- WebPageTest [EN]
- Wormly [EN]