This time skumora found something great, and it is worth to be shared here!

It is possible to build a list of tags (not a cloud, but a list), with Tumblr custom tags, so no thirds parties tools here.

Check it out here -> http://skumora.tblog.com/post/1970022910

Bare in mind… if you have Tumblr for quite a while, you need to tag all your content

Enjoy!