Village Info is a mod which shows some information about the village you're currently in. It also tells you if there's a village nearby.
This mod expands your F3 screen to indicate whether you're in a slime-spawning area. It takes both slime chunks and swamps into account, and also checks the height. Additionally, it displays the numeric world seed.
Unglitch is a bugfix mod to prevent entities from glitching through blocks and to reduce client/server desynchronization issues.