Hi, is there a official place for sharing and finding new projects on the cardano blockchain?

You are in the right place here Gains There are also several community developed tools to help you find your way through different projects. cardanocube.io is one of them. Cardanocube does not list all projects available, but it’s a start. You can always use this TG channel to ask around if you’re looking for anything specific (Cardano related)