Those aren't meant to be apps representative of the Mobifree "platform", those are existing projects that have agreed to partner with Mobifree towards a common goal. They're bulletpoints in thd same list as Murena the E Foundation.
As far as answering your actual question, you'd probably need to ask the project devs for Quicksy and Conversations?
> Why can't Quicksy's contact finding feature be added to Conversations instead of being a whole fork?
Quickly is designed to have easy phone number registration and contact discovery like the currently popular walled garden chat apps. Conversations works with any XMPP address and you need to ask people for their chat address (like email).
Why can't Quicksy's contact finding feature be added to Conversations instead of being a whole fork?
Delta chat I kind of get why it's a separate thing since it works differently, but it still seems counter productive to have so many chat apps.