There was also Wurmz!, a networked multiplayer version of Liero. Some history and binaries of various version as well as the source code can be found on this website [1]. [1] https://mental-reverb.com/wurmz.php
We played LieroX a lot at school as we could add a bunch of fun mods to it and it was networked. I think at the time, LieroX had just came out too, so it was fresh compared to Liero.