YASnippet is a template system for emacs. It allows you to type a abbrevation and automatically expand the abbreviation into function templates.

Bundled language templates includes: C, C++, C#, Perl, Python, Ruby, SQL, LaTeX, HTML, CSS and more.

Yasnippet system is inspired from TextMate’s template system. You can use a tool to import any TextMate template you have to YASnippet.

via yasnippet – Google Code.

ack is a tool like grep, aimed at programmers with large trees of heterogeneous source code.

ack is written purely in Perl, and takes advantage of the power of Perl’s regular expressions.

via ack — better than grep, a power search tool for programmers.