You can find the software details and download link on the Softpedia Gaming Keyboard Splitter page.

Several open-source and freeware projects match the "gaming keyboard splitter" description on Softpedia. The most prominent include: 1. Keyboard Splitter (by DjSubox / KeyXing)

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Games like Cuphead , Overcooked , Lego Star Wars , and Enter the Gungeon are best enjoyed with friends. If you do not own multiple gamepads, this tool lets two players share one keyboard (e.g., Player 1 uses WASD, Player 2 uses the Arrow keys). 2. Utilizing Two Keyboards

Use separate keyboards for tournament-style play without gamepads. Conclusion