We have now opened a commercial services section here on the forum for registered users. If you have a Fabrik project that you wish to have someone work on for you, post it under Help Wanted. If you are an application developer and wish to earn some money helping others, post your details under Fabrik Application Developers.
Both of these are unmoderated. It will be up to both parties to work out the details and come to an agreement.
For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Given that Media-A-Team are using Fabrik in their commercial products for customers one has to assume there will be some move to J4 Fabrik. How this J4 version is made available is another matter.I would be happy with a confirmation that it's "work in progress". Timelines vary and these days that is especially true. Still, other developers have made statements regarding their J!4 readiness, JEvents for example. So when I come here, and I don't see a new forum thread, or news blog post discussing upcoming version plans, it makes me wonder if it is actually "work in progress".