2006Rebotted 2.0 Client - an open source, bottable remake server. Pull requests welcome
Discord Link: https://discord.gg/4zrA2Wy
If you want to play the server, check out 2006rebotted.tk
How to Develop 2006Rebotted 2.0 Client
Step 1: Register a GitHub account
Step 2: Fork this repository
Step 3: Install IntelliJ Community Edition: https://www.jetbrains.com/idea/download/
Step 4: Open IntelliJ and click "File > New > New Project from Version Control"
Step 5: Enter the URL of your forked Github repository, and hit "Clone" (Image)
Step 6: Right click pom.xml, select Maven and click Reimport (Image)
Step 7: Click "Run Core" (Image)
How to get your code onto this project page
See this forum post.