The above are part of Creature Diversity linked by Kasildor - But Creature Diversity is a bit out of date I think, LittleBarons have had updates since which Zaldiir knows about and was going to implement, however there have been hiccups with version 2 of Creature Diversity and it has not been released yet.
According to changelog of Creature Diversity it includes update of LittleBaron's Vermins to version 1.5. Little Baron Undead Additions has not any updates. Update of Little Baron Water Beasts 1.3 only tweaks meshes and textures. It can be installed on Creature Diversity, just need to find and overwrite 3 meshes.
http://www.tesnexus.com/downloads/file.php?id=21104 - add new books and ingredients.
http://www.tesnexus.com/downloads/file.php?id=4318 - make the normal thievery more fun and worthwhile. There is a chance now you may find a magic weapon, magic armor, a big amount of gold or (magic) jewelry in anymiddle or upper class house.
http://www.tesnexus.com/downloads/file.php?id=36362 - add Bala Stones to Ayleid ruins, which are basically the Ayleid Equivalent of Sigil Stones.
http://www.tesnexus.com/downloads/file.php?id=39549 - new welkynd stone that restores your health rather than your magicka.
http://www.tesnexus.com/downloads/file.php?id=19140 - adds collectible cards that are hidden all over Cyrodiil - 300 cards in the current version.
http://www.tesnexus.com/downloads/file.php?id=7341 - make closing Oblivion gates always rewarding. Add many more stones. Many of which have multiple buffs and weapon enchantments which are individually rather minor for balance, but should prove to be more useful in certain situations.
http://www.tesnexus.com/downloads/file.php?id=30859 - add achievements for doing something noteworthy. They can redeem for cool prizes, such as weapons, house upgrades, own summonable companions.
http://www.tesnexus.com/downloads/file.php?id=9412 or http://www.tesnexus.com/downloads/file.php?id=37280 (second more balanced) - adds more than 250 runeskulls to the game. They let you enchant weapons and armor without using an enchanting station, like sigil stones.