Collaborators on a version-controlled .tex file can track changes.
LaTeX Track Changes shows changes over time for a .tex file that has its history stored in a git or svn repository. The user can customize how to view the changes: limited to certain authors or by revision or date among other filters. An Emacs mode provides the user interface. Plug-ins for other editors (such as TeXShop) are planned.
Transliterator between any Language files - Map Fonts, Create Encoding Scheme, Input Phonetic, Indian, Roman, Tamil, Hindi, English, French, German, Spanish or Any World Language Keyboard. Ex: [Phonetic Input]-[Any World Language Output] or ViceVersa.
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)