ECB is a file/code browser for Emacs. It can be used to browse any type of file and supports parsing of Java, C, C++, Elisp and some other code like perl, TeX, LaTeX. All browsing windows are within one frame and they are deletion-protected (eg by C-x 1)17 weekly downloads
JazzScheme is a programming language based on Scheme. It is also a full featured development platform that has been used for more than 10 years to develop high-quality commercial applications.