There is a range operated by the state east of Ocala in the National Forest. IIRC it's off FR 11 which is old FR88 which is off SR40.
https://www.fs.usda.gov/recarea/ocala/recarea/?recid=40236
It can get crowded, it can have unsafe shooters, it can have self-appointed Range Nazis, it can have old fuckers scurrying at your feet to pick up each and every piece of brass that leaves your firearm, it can also have sketchy looking folks. But it's free.
The best times to go are the first few hours of daylight or the last couple hours of daylight.
If you use the facility, I highly recommend you 1) take someone with you; 2) only remove from your LOCKED vehicle one gun at a time to shoot; and 3) make sure someone stays at the bench with your gear when you go downrange to post/check targets.
Other than that, I'm unaware of any other places that are open to the public and free.