Yes, many options exist. The big one is Flippa which will take just about any project and allow you to list. There are others that are specific for large businesses (either have a listing price floor or a revenue floor) such as FE International and Empire Flippers. Another new one that is 0% commission is MicroAcquire. I follow the founder on Twitter and they seem to be doing quite a bit of volume.
I've personally sold projects on both Flippa and MicroAcquire and happy to chat about the pro's/con's of each.
It looks like it is a whole business acquisition so all of the business or nothing. My app business for ios has been around since 2009 so I'm less desiring to part with it. I can part with some apps that are basically feature complete, mature and stable income.
I believe I saw Andrew (founder, operator of MicroAcquire) tweet out that some deals are for partial equity of a company. It's really just a listing page and from there the buyer/sellers are free to do what they want. If you had apps that you want to offload, just list and see what type of buyers approach you. Since there are no listing fees it's no risk (other than your time).
The issue I had with Flippa when I listed a business there is that there are a TON of tire kickers. Flippa has a lot of users, but I'd say many aren't serious buyers. Flippa will prepopulate "inquiries" to sellers with some standard questions (ex. "How much time are you spending on the business each week?" etc). I learned to just ignore any message that contained only those prepopulated messages after a while. At first I spent time crafting responses to them only to be ghosted after that. If a potential buyer can't take the time to write their own opening message, they aren't serious.
You could try listing them here. May or may not favorably influence the price, in the same way private forum sales can sometimes go more interestingly than eBay et al.
I've personally sold projects on both Flippa and MicroAcquire and happy to chat about the pro's/con's of each.