GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of preprocessing tasks. Its independence from any programming language makes it much more versatile than cpp, while its syntax is lighter and more flexible than that of m4. The syntax is fully customizable, which makes it possible to process text files, HTML, or source code equally efficiently in a variety of languages.
Unifdef is useful for removing #ifdef'ed lines from a file while otherwise leaving the file alone. You specify which symbols are defined or undefined with -D and -U flags, and unifdef removes the corresponding ifdefs, and the enclosed code if appropriate. It's especially useful for removing those "#ifdef BROKEN" and "#ifdef PRIVATE" clauses from code before you release it. Unifdef acts on #if, #ifdef, #ifndef, #elif, #else, and #endif lines, and it knows only enough about C and C++ to know when one of these is inactive because it is inside a comment or a single or double quote.
distcc is a parallel build system that distributes compilation of C/C++/ObjC code across machines on a network. It can be set up in just a few minutes and makes builds up to ten times faster. It does not require machines to share a filesystem or have the same libraries or header files, and installation does not need superuser privileges.
Generally, mod_ocaml is a flexible apache module for use of INRIA's powerful OCAML interpreter as a Web scripting language (with functional and imperative features). Simply embed OCAML code between HTML on your pages, like you do with PHP, mod_perl, etc. After modifying some settings, you can use almost any interpreter for providing dynamic content on your HTML pages.
Preprocess allows you to write unit-style single-source-file C or C++ modules, from which it generates header and implementation files. It automates tasks such as declaring new functions or methods in the header file, putting modifiers like "inline", "virtual", "static", "explicit" in the right place (header or implementation file), and putting inline files into the header file in the correct order. Also, for debugging or profiling builds, Preprocess can optionally generate all inline functions out-of-line.
prtpacker (Portable Resource Tree Packer, pronounced PIRT-Packer) is a tool for creating C or C++ source code from external program resources such as images, text, or data. These resources can be arranged in a tree structure much like a typical file system. After compiling and linking the resulting source code you can access the resource tree from within your software through a simple API. Be aware that all resources stay in memory and cannot be easily deallocated.
h2incn tries to directly convert C/C++ headers to Nasm-style include files, and can be used in a makefile. It is useful if you want to use the same structures or external variable declarations in C and assembler code, and you don't want to use two separate files and update both each time you change something. It is written in a mix of C and C++ code. It currently works for simple files.