Has anyone here ever use this software before? Acmlmboard hasn't been actively developed by the original creators in a very long time. However, The Cutting Room Floor's message boards uses a branch of the software that's maintained by Xkeeper the owner of the website. (Fun fact, he used to be an admin for Sonic Retro a Sonic forum I'm active on lol.) There's another branch called Acmlmboard-2 that's being maintained by the owners of another forum called Kafuka, though that repository hasn't seen an update in four years. The software looks outdated, but one thing I do like about it is that each member can edit the CSS of their own posts to make them look unique. I don't think there's any other software that does this without modifications or plugins. If you're interested in checking out the repositories for each branch of the software, here they are.
https://github.com/Xkeeper0/julhttps://github.com/acmlmboard/acmlmboard-2
https://github.com/Xkeeper0/julhttps://github.com/acmlmboard/acmlmboard-2