Could you expand on what options exist currently? You say you are in the space, does that mean you have been keeping an eye on it, that you are working on something, or ?
The two commercial tools that come to mind are:
* Dex (https://getdex.com/)
* Clay (https://clay.earth/)
Although neither have really nailed it (yet). Clay is more like a Superhuman-for-Contacts, whereas Dex is really going hard at being a true PRM.
The big open source tool out there is:
* Monica (https://www.monicahq.com/)