We get a lot of projects that just start with a page on STOMT to collect wishes for the project. It's basically a mix of feedback management and community building.
Example: https://www.stomt.com/stomt
We used it to collect and manage our own ideas and at the same time we shared labeled stomts with friends and used this as priorization tool while building the platform itself.
Mostly used by game developers we get more and more SaaS and app projects on board. It has a freemium tier that is good enough to let your project becoming big.
Edit: And btw.. users don't have to sign up but can leave their e-mail address optionally to get notified.
