Welcome to the ECO Mods forums.
Since you've came across this website i'm assuming that you've already played ECO by StrangeLoopGames. If not, check it out right now, it's worth it!
ECO Mods aims to become the place to go when searching for modifications and plugins for your ECO multiplayer-server and creating a helpful community that have a good time talking about and most important playing ECO in general. We're already providing our users a working resource manager by XenForo where mod-developers can upload and advertise their newest ECO mod. This way, people who run a multiplayer-server for ECO can easily search for a mod or a plugin to use on their server, without having to explore dozens of different websites.
ECO Mods is completely free to use. You just need to create an account, and you're good to go. 
Regards,
Looh