Minecraft Model Designer. A recreation of MrCrayfish's Model Creator inside of Minecraft! Blockbench is easy to use and comes with a browser app.
This is for setting the texture resolution of the model. This tool requires JavaScript to be enabled. This tool is in no way affiliated with Mojang AB.
Random models Freshness Popularity Block Count.
Includes many animals, block, flowers, mushrooms etc. and of course Steve.
MrCrayfish has not been fond of the new JSON rendering system Writing block models in JSON is annoying because you can't see what it looks like. This tool requires JavaScript to be enabled. Let me know if you're interested.