Crystal REVS for C

Crystal REVS is the best context-sensitive editor there is.

Review Code in No Time
Create Flowchart from Source for a clear view of the code
Verify correctness of function. Detect errors
Use Flowcharts for quick Code-reviews
View Flowcharts – level wise, optimal, loops, conditions, area wise.
Code and Flowchart Synchronization when browsing
Comment-based flowcharts for a wider audience.
Export flowcharts to BMP/JPEG/VISIO formats.
Code-only, Comment-only and Code+Comment flowcharts.
Print large flowcharts on a single page.
Code is Easy-to-read:
Auto-Formatting of Code and Comments.
Line up object-names in successive declarations.
Line up assignment operators in assignments.
Split and indent long expressions as per operator precedence
Transform hard-to-read code into very readable code.
Improved code readability. Detect errors easily

Other features
Editing and Formatting in Real Time
Tokens and Comments Panel for easy code entry
State Diagrams
File/Project/Function Call-Trees, Caller Trees, Include Trees & Include By Trees, Paths.
Premium Code/Comment Browsing
Project Level - Word/Object/Modified Object/Regular Expression/Lexical Search
Software Metrics - McCabes, Halstead
HTML documents of source+comments (Javadoc like!). No need to maintain HTML documents - just comment code with Comments Panel. Cross-reference for all identifiers, Color Coded Metrics display.
Import projects from VC++. Visual Studio.Net, Borland
Language Extensions + Keil Compiler Support
SCC Integration
Editions:
Rules: MISRA C Static Checking
DataFlow: Rich Trees, Data Flows for an object, Call Flow, and Flowcharts with inline expansion.
Docs: Flowcharts, trees, Source Code listing with full-fledged browsing in HTML docs.
Professional: Base+Rules+Docs Editions
ProPlus: All the above + Full Project Flowchart