mMass supports many open formats like mzML, mzXML, mzData, MGF, ASCII and even copy n' paste from clipboard.

For data processing re-calibration, smoothing, baseline correction, auto peak picking, deconvolution are supported.

Dedicated tools allow you to generate molecular formula from given mass or compound isotopic pattern or search databases to analyze your low-mass data.

Starting with protein or peptide sequence editor you can do in-silico digestion, fragmentation or use on-line protein identification tools.