Hi! langere.de provides multiple services:

• A federated Matrix instance (chat, audio, video)
• The corresponding Element web client - only recommended if you don't have access to a native compatible client
• Terraforming Mars
• Private Bin instance
• Ogame
• A private torrent tracker

There is also a permanent Mumble server available at the relevant standard port. Seasonally there are private Arma3-, Minecraft- and WoW-servers available. Keep in mind that only the Mumble server, Private Bin and Terraforming Mars can be used without prior authorization.