via @errant253
| Instance | Web Archive? |
|---|---|
| https://xnologin.com | ✅ |
| https://nitter.meowing.monster/ | ✅ |
| https://nitter.xitter.cc/ | ✅ |
| https://shi.meowing.de | ✅ |
| https://nitter.mie.foundation | ✅ |
| https://nitter.tiekoetter.com/ | ✅ |
| https://shitter.thepixora.com/ | ❌ (DogWAF) |
| https://nitter.pp.ua | ❌ (DogWAF) |
| https://nitter.miningtcup.me/ | ❌ (DogWAF) |
| https://nitter.kareem.one | ❌ (Cloudflare) |
| https://xcopy.uk | ❌ (Cloudflare) |
| https://nitter.netbub.com/ | ❌ (Gandalf) |
| https://nitter.jaydenha.uk/ | ❌ (Shield) |
| https://nitter.click/ | ❌ (Aragorn) |
| Instance | Web Archive? |
|---|---|
| https://goyimx.com/ | ✅ |
| https://xitter.gq/ | ✅ |
| https://teapaw.org/ | ✅ |
| https://teapawt.org/ | ✅ |
| https://nitter.gq/ | ✅ |
| https://xitter.cf/ | ✅ |
| https://teapawt.net/ | ✅ |
I made a comprehensive up-to-date list since OP is inactive and the other guy who posted an updated list here deleted his comment.