Polar.sh

Polar is an implementation of Ticket Bounty Model. You can pledge some money to a specific ticket so that the maintainers can rank by importance.

There is one concern that Polar can omit for Ticket Bounty Model, and that's choosing the right price. For Polar, the prices are pledged by the backers so that the invisible hand will adjust the price accordingly. However, the fundamental question of the Ticket Bounty Model is whether it is possible to implement a performance-based meritocracy in a company environment. It would be very hard to budget the right price in such case.