TikZiT is a free software that allows you to create and modify TeX diagrams written using the pgf/TikZ macro library. TikZiT is especially geared toward rapidly creating "dot"-diagrams for use in academic papers.
Here are some key features of "TikZiT": · creates and modifies TikZ-based diagrams · parses TikZ on-the-fly · support for multiple edges, curved edges, self-loops, and edge nodes · label vertices