An attempt to embed LaTeX environments such as display math or figures into the source buffers. Provides the manual, mailing list, screenshots and download.
Project fused work on GNU C, C++, Objective-C, Ada, Fortran compilers, and libc++, to speed up work to improve GCC. In April 1999 was merged into general GCC effort under control of GCC steering committee. Descriptions, a few links.