LinX is free and open source software provided under the Apache-2.0 license.
LinX is a tool fo evaluation of mass spectrometry data from chemical cross-linking.
The new, major advantage of LinX compared to similar software is a feature enabling the identification of intermolecular cross-links from homodimer interfaces using 15N-labelling.
Download LinX here or the source code here. (Right-click and choose "Save Link As...".)