ActiveState Komodo is the award-winning, professional IDE for open source languages, providing a powerful workspace for editing, debugging, and testing applications in Perl, PHP, Python, Tcl, and XSLT. Komodo offers an advanced language-aware editor with features such as background syntax-checking and auto-completion; an easy-to-use, yet powerful debugger; source code control integration, CGI emulation, and templates. Komodo also features individual language tutorials providing an overview and practical demonstrations. The 2.5 release includes major performance enhancements, UI refinements, and a major upgrade to the GUI Builder.