Perl is a family of high-level, general-purpose, and dynamically interpreted programming languages. It borrows some syntax from C, Unix Shells, and AWK or SED, and more or less reinvented modern regular expressions. Perl 5 is the current mainstream version, with over 20 years of development. CPAN provides a modular packaging system, and allows Perl to be used for web applications, graphics programming, networking, system adminstration, and many sciency applications.
EndTeX is an attempt to overcome EndNote's refusal to support BibTeX. It is run instead of BibTeX with the same options. When run it scans the .aux file for bibliography files and then looks for a matching file with a .txt suffix (eg bibfile.txt) which it assumes is an EndNote bibliography in the correct format. It then parses it into a BibTeX bibliography and finally runs BibTeX.
Mawk (Mike's AWK) is an interpreter for the AWK Programming Language.
LTM is a graphical task manager. It provides top-like process lists or an application-grouped list, as well as a load graph. It allows to kill or renice running processes. It comes in a single Java JAR.