It's still actively being maintained. They're on version 6 now. The software isn't highly used like it used to be, but it's still available for forum owners that would rather use it. That's the best thing about having the power of choice and options. You don't have to stick to just one software. The only software that isn't actively maintained right now is Mybb. It hasn't been updated for a year now. Their last major release was 1.8.38, which was on April 30th 2024.vBulletin is quite deprecated nowadays and no longer maintained.
https://mybb.com/versions/
vBulletin 6.1.1 is now available. - vBulletin Community Forum
<h1>vBulletin 6.1.1 Changes and Updates</h1> <p>vBulletin 6.1.1 is now available to download. In the upcoming weeks, vBulletin Cloud customers will be automatically upgraded to the new version.</p> <h2>Front End Changes</h2> <h3>Forum Card View</h3> <p>Administrators can
forum.vbulletin.com
in fact, vBulletin 6.1.1 was just released on March 25th.







