TOPPView is a viewer for MS and HPLC-MS data. It can be used to inspect files in mzML, mzData, mzXML and several other file formats. It also supports viewing data from an OpenMS database. The following figure shows two instances of TOPPView displaying a HPLC-MS map and a MS raw spectrum:

More information about TOPPView can be found on the OpenMS ReadTheDocs page: https://openms.readthedocs.io/en/latest/docs/tutorials/TOPP/toppview-introduction.html

The command line parameters of this tool are:

TOPPView -- A viewer for mass spectrometry data.

Usage:
 TOPPView [options] [files]

Options are:
  --help           Shows this help
  -ini <File>      Sets the INI file (default: ~/.TOPPView.ini)
  --force          Forces scan for new tools/utils
  --skip_tool_scan Skips scan for new tools/utils

Hints:
 - To open several files in one window put a '+' in between the files.
 - '@bw' after a map file displays the dots in a white to black gradient.
 - '@bg' after a map file displays the dots in a grey to black gradient.
 - '@b'  after a map file displays the dots in black.
 - '@r'  after a map file displays the dots in red.
 - '@g'  after a map file displays the dots in green.
 - '@m'  after a map file displays the dots in magenta.
 - Example: 'TOPPView 1.mzML + 2.mzML @bw + 3.mzML @bg'

Note: By default, TOPPView scans for novel TOPP tools if there has been a version update. To force a rescan you can pass the –force flag. To skip the scan for tools, you can pass the –skip_tool_scan flag.