Peak List 2 MSP takes your ascii mass/intensity pair list (or lists) and swaps them into MSP format (NIST standard text files for searching).
It:
takes lists from the clipboard (or drag and drop),
sorts them by mass,
normalises intensities,
rejects below a cut off (that you define),
adds MSP headers,
puts the result back in the clipboard (or a file),
has a command line interface so you can pass files in programmatically,
has an api so you can...