xiSPEC is for biologists and mass-spectrometrists. Spectrum viewer stands for: Automated spectra annotation, Intuitive interaction with data, Easy testing of hypotheses, Export for publication.
Because of the architecture of Xi Spectrum Viewer, there are four possible application models comprising two server models, a user-interaction model and an embedded model (e.g. for online journals).
Xi Spectrum Viewer is an open source project on SourceForge.