teenytools has many frequently used tools by developers every day, it provides both the ease of access on commonly used tools and a depth of customizations on those tools too.
wrighter is a modern WYSIWYM #tag based markdown editor on the web. wrighter's "bites" help you manage unorganised thoughts which you can later use while writing, you can use wrighter to even publish your blogs or use it just as an editor without signing up!
Wrighter