Excalibur is a program for running Netrunner tournaments with single-game rounds. It is not very polished, but it should be adequate for running small test tournaments to experiment with the single-game-round tournament format.
You can read a rambling explanation of how the pairings rules work in pairings.md.
Instructions
On the command line, run Excalibur with the name of a save file, like so:
excalibur test_tournament
If the specified file exists, the newest save in it is loaded; if it doesn't exist, it is created. If it exists but is not an Excalibur save file, probably bad things happen. I haven't tried it.