XMLStarlet is a set of command line utilities (tools) to transform, query, validate, and edit XML documents and files using simple set of shell commands in similar way it is done for text files with UNIX grep, sed, awk, diff, patch, join, etc utilities.
Light-weight Scintilla-based text editor with syntax highlighting
Notepad3 is a fast and light-weight Scintilla-based text editor with syntax highlighting. Notepad3 is an excellent replacement for the default Windows text editor. Notepad3 offers many extra features over Notepad. It has a small memory footprint, but is powerful enough to handle most programming jobs.
XML Differencing and Patching tools.
XML based tools to mimic the functionality of traditional line based diff and patch utils, except operating on the hierarchical structure of XML.
latexdiff is a Perl script, which compares two latex files and marks up significant differences between them (i.e. a diff for latex files). Various options are available for visual markup using standard latex packages such as "color.sty".
Another Diff is a utility like anothers diff utilities but that's works how I want and its run in mono also, so can be used in Linux and Windows.
No is necessary install, or install any third part library to run (Except mono or .net framework).
A powerful class which allows to create and merge unified diff patches into any file. Fully written in PHP, uses the GNU standard unified diff format and allows any operation (creation/update/deletion).
The most powerful non-commercial translation memory software (TM tool) with enhanced capabilities, like networking/collaboration (http, rpc), encoding conversion, project management capabilities, email capability with attachments, file tree diff etc.