A reverse engineering suite (decompiler, editor, debugger and more)
RenderDoc is a stand-alone graphics debugging tool
An in-app debugging and exploration tool for iOS
A library for debugging android databases and shared preferences
A little native network debugging tool for iOS
Bug-fix-only libev port of shadowsocks
A UIView debugger (like Reveal or Xcode) that can be embedded
HTML/CSS/JS and Markdown Playground For Web Designers and Developers
Realtime preview for designers and developers.