CCured
- Source-to-source translator for C, which analyzes the program to determine the smallest number of run-time checks that must be inserted in the program to prevent all memory safety violations.
- http://hal.cs.berkeley.edu/ccured/

GNU Source-highlight
- Source-highlight, given a source file, produces a document with syntax highlighting. [Open source, GPL]
- http://www.gnu.org/software/src-highlite/

Cscope
- Cscope is a developer's tool for browsing C programming code.
- http://cscope.sourceforge.net/

Cxref
- Cxref is a C source code cross referencing and documenting program for UNIX, written by Andrew M. Bishop. Cxref makes both html and latex style document.
- http://www.gedanken.demon.co.uk/cxref/

GNU cflow
- GNU cflow analyzes a collection of C source files and prints a graph, charting control flow within the program. [Open source, GPL]
- http://www.gnu.org/software/cflow/

KScope
- KScope is a KDE front-end to Cscope. It provides a source-editing environment for large C projects, such as the Linux kernel. [Open source, GPL]
- http://kscope.sourceforge.net/

OpenGrok
- OpenGrok is a fast and usable source code search and cross reference engine. It helps you search, cross-reference and navigate your source tree. It can understand various program file formats and version control histories like SCCS, RCS, CVS and Subversio
- http://www.opensolaris.org/os/project/opengrok/

Splint
- Splint is a tool for statically checking C programs for security vulnerabilities and coding mistakes.
- http://www.splint.org/

GNU GLOBAL
- GNU GLOBAL is a source code tag system that works the same way across diverse environments. [Open source, GPL]
- http://www.gnu.org/software/global/

CodeViz
- CodeViz provides the ability to generate call graphs to aid the task of understanding code. [Open Source, GPL]
- http://www.csn.ul.ie/~mel/projects/codeviz/

Indent
- A tool for formatting C code. [Open source, GPL]
- http://www.gnu.org/software/indent/indent.html

Crystal C/C++ Suite
- A suite of C/C++ review, visualization and editing tools: Flowcharts, Tokens Panel, Comment Generator, and Auto-Formatting in real time, call/caller/file graphs.
- http://www.sgvsarc.com/

Development Assistant for C
- Supports a wide range of software development activities, from easy editing to controlling source quality, from detailed reviewing to documenting. By RistanCASE.
- http://www.ristancase.com/

ASTREE
- A static analyzer analyzes reactive, critical, real-time programs written in the C programming language and looks for runtime errors.
- http://www.astree.ens.fr/

Myer
- Colorizes identifiers and constants to show their marginal cost to the program's coupling and cohesion metrics. [Open source, GPL]
- http://home.comcast.net/~jyavner/myer/

CC Shell
- Allows C source files to be directly executed as scripts (using #!), speeding development and simplifying maintenance.
- http://ccsh.sourceforge.net/

C Module Viewer (CMV)
- A small and smart programming tool that supports software engineering under C in the subjects modularity, overview and navigation (for Windows 9x/NT/2000). By Ezer Programmings.
- http://www.ezer.de/

Insure++
- An error detection tool for C/C++ that automatically finds hidden errors at the source code level.
- http://www.parasoft.com/jsp/products/home.jsp?product=Insure&/index.htm

Lint Plus
- Source code analyzer, detects problems compilers cannot catch, by Cleanscape Software.
- http://www.cleanscape.net/products/lintplus/

Compilercache
- Caches compiled object files to dramaticly speed up compiles. More convenient than make, and speeds up builds (like RPM builds) that make doesn't. Obsoleted by ccache.
- http://www.erikyyy.de/compilercache/

C to Java converter
- Convert C preprocessed source to Java.
- http://www.soften.ktu.lt/~stonis/c2java/index.html

Exuberant Ctags
- Generates an index (or tag) file of C language objects found in C source and header files that allows these items to be quickly and easily located by a text editor or other utility. [Open Source, GPL]
- http://ctags.sourceforge.net/

CodeSurfer
- An analysis and inspection tool that lets software developers and maintainers easily understand detailed dependence relations in source code.
- http://www.grammatech.com/products/codesurfer/

LCLint
- Tool for statically checking C programs. [Open source, GPL]
- http://lclint.cs.virginia.edu/