Diffinity is a diff and merging tool with focus on accurate and easy to read source code diffs. Top features: thumbnail view, folder comparison, tabbed interface, instance highlighting, syntax highlighting and unicode support.
A Quick Look plugin that renders source code with syntax highlighting
A Firefox add-on that allows you to view code using a syntax highlighter
Free and easy to use source code editor for your Mac
Open source QuickLook plug-in that provides source code file preview capabilities with syntax coloring
Wiki Plugin for Vim Editor – Wiki plugin for the Unix editor Vim
Apache Configuration Language Module for BBEdit – Language module for Apache config files, for use with BBEdit 8.0 or later
GLeDitor – the programmer’s editor with syntax highlight, extended search features, beautiful icons and colors.