Sharehive, formerly Tibba. Actually existed as a mobile application before the founders won a competition while i was working at Fika Apps.
I developed a web version of the mobile app for them, initially using Stripe connect to send payments from member to member involving a fee.
Members could register, upload skills with images, prices and descriptions. Other members could then chat with them using a real-time inbox feature, then they could create contracts, have them signed off, and
Further development removed the fee and instead charged a monthly subscription for access using Stripe Billing, as well as adding a job board and more.
While this version of the site no longer operates today due to business changes, it's still one of my favourite projects i've ever worked on.