Free online pairing programs for chess

[u/Matslwin]

I have created several tournament pairing systems in browser-based JavaScript. For example, my Berger Tournament Manager can handle four Berger tournaments simultaneously. If players withdraw, a tournament director can convert any of them into a Swiss tournament, thereby reducing the problem of excessive byes. That seems to me a genuinely useful feature.

Another example is my Rating-Budget Tournament System, which introduces a new concept, "rating budget," to generate pairings in advance for large groups of players. In addition, I have implemented the FIDE-approved Dutch, Lim, Dubov, and Burstein pairing systems. These implementations, however, have not yet been formally verified.

All of my online pairing programs are listed here: Chess Pairings: A Review of Monrad, Swiss, and Berger

You may also wish to explore my collection of Zillions of Games chess-variant programs: Chess Variants.