1)   Crystal FLOW for C++ 1.42
Crystal FLOW for C++, is extremely valuable for familiarizing with or reviewing C/C++ code. It provides: Flowcharts from Source Code, Autoformatting for easy readability, Project-Overview, Browsing and Navigation. Export flowcharts to Bmp/Jpg/Visio

 2)   Crystal FLOW for C 2.0
Crystal FLOW is extremely valuable for reviewing C/C++ source. It provides: Flowcharts from Source, Autoformatting, Project, Browsing, Visio/Jpg/Bmp export. State/Transition diagrams, custom-shapes Docs Edition: HTML docs with flowcharts, trees

 3)   Crystal REVS for C 1.42
Crystal REVS has the best code review, edit and visualization tools. It provides Flowcharts, Tokens Panel, Comment Generator, Auto-Formatting in real time