Ok, I decided to learn how to write add-ons for XF. I tried this tutorial successfully: http://xenforo.com/community/threads/creating-an-addon.5416/ The general way to create add-ons is very easy (the ACP stuff), but my question is, where do I get these fancy functions like public function actionAddThread() $username = $visitor['username']; $visitor['message_count'] from? Is there any documentation with all of XenForo's functions, variables and such? I mean if I want to write an add-on that checks how many likes a user recieved, from where do I get the function besides browsing through all of XenForo's core file and looking for some strings that make sense? I have experience with MyBB and was able to make my own small mods solely due to a list of available functions and examples. This is something what I miss for XF.