1. Host your images for free

01. TinyPic
02. ImageShack
03. Photobucket

2. Fonts for free

01. deviantart
02. dafont 
03. 1001freefonts
04. abstractfonts
05. creamundo
06. fontfreak
07. fontspace
08. searchfreefonts
09. whatfontis

3. Picture editing sites 

01. Pixlr
02. Fotoflexer
03. Lunapic
04. BeFunky

3. HTML colors

01. colorpicker
02. mxstudio
03. w3schools
04. html-color-codes

4. Tumblr links

01. Tumblr Preferences: change your e-mail, password, language, etc.
02. Tumblr Bookmarklet: share on Tumblr things that you find on the web
03. Tumblr Mega Editor: mass edit your posts
04. Creating a custom HTML theme

5. Others

01. Tumblr Stats: tells your about your blog using charts and graphs
02. Trntbl: listen to all the audio posts on a Tumblr
03. Tumview: view all your Tumblr images
04. Deviantart: find backgrounds, graphics, patterns and much more
05. ColorLovers: search and create color palletes and patterns