MineTogether

MineTogether is a platform that also contains a multiplayer enhancement mod.

This mod provides features such as;
Friends lists
Global chat
Group chat
Direct messages
Server list
World pre-generation
Private minigames
Server invites

Other parts of the platform provide cloud saves and oAuth services.

You do not need any CreeperHost services to use this, nor do you need to be a CreeperHost partner (although, it does help as it allows you to monetise your modpack via us)