I am only aware of the OrgiOrg pool, and the one I am offering. There are some accounts in heatwallet which contain the name of "pool" but none of them are actually containing multiple lessors.

Thus far heatpool.org is operating very stable, but using a manual calculation, awaiting the release of microservices to gradually move over to automation. You can at least keep an overview of the open balance of all lessors at the website of heatpool.org, and I have thus far processed all payments within a reasonable period of time, most often 24 hours. If a lease period has ended without extension I will also process the payment asap. Any open balance will also be included in your effective stake in the pool, so even with a later payment none of your rewards are "lost".

I am still surprised (and delighted of course!) to see heatpool as the #2 forger in the total list of forgers at heatnodes.org. The current effective balance is around 1.5M HEAT, with most of the times around 35 lessors.