NimbleText - NimbleText is a text manipulation and code generation tool available online or as a free download.
Git Sketch Plugin - Version control for designers
Heytools - JavaScript tools, AJAX tools and some fully server side tools.
Anima App - Design, get feedback, convert to code, publish, iterate.
TextPipe - Search and Replace, Find and Replace, Web Sites, Database Extracts, XML, CSV, Tab, mainframe COBOL data and more
Marvel for Sketch - Sync, play and record prototypes in Sketch!