I am currently using Jetbrains Space EAP cloud version and I think it's really good. The self hosted version is not even out in early access currently but it should be soon. I know there isn't much to be done until the self hosted version is released but I wanted to get this up here early for everyones consideration as it would complete the dream Cloudron setup for my company.
Major downside I see right now is it isn't open source (does Cloudron allow proprietary apps in the app store?) but hopefully there will at least be a community version that is open source when they leave EAP. Either way I'm pretty sure someone from Jetbrains would be willing to help get it working on Cloudron.
Edit: forgot links
does Cloudron allow proprietary apps in the app store
Yes. As a company, we are more into self-hosted apps than just opensource apps. Opensource apps are of course easier to package and for us to contribute as well but it's not a requirement. We have apps like Confluence, Emby, Teamspeak, Minecraft apps etc which are not open source.