9 Cheat Sheets websites for web developers.

0. htmlreference.​io
1. cssreference.​io
2. gitsheet.​wtf
3. htmlcheatsheet.​com
4. overapi.​com
5. devhints.​io
6. grid.​malven.​co
7. cheatography.​com
8. developer-cheatsheets.​com

What would you add?