Arma Reforger server tools
Things to do with the data, not just read it.
Compare two servers
Mod by mod: what only one has, what both have at a different version, and how many GB more you would download to switch. Downloadable as CSV or JSON.
Hosting calculator
How much RAM, CPU and disk your server needs, read off the servers already running with a similar modpack and player count. Measured, not guessed from a formula.
Every server page also exports its mod list as JSON, and the API serves the same data to your own code.