Pull Request Roulette is described as 'On this site there is a list of pull requests (or PRs) submitted for review, belonging to open-source projects hosted on Github. Click the PR to open it in a new tab or window. Click Take (when logged in) to commit to reviewing that PR'. There are three alternatives to Pull Request Roulette for Online / Web-based. The best alternative is ContribHub, which is both free and Open Source. Other great apps like Pull Request Roulette are 24 Pull Requests (Free, Open Source) and CodeMill (Paid).
ContribHub was born on 2012 at PulsoConf/BogotaConf hackathon after 14 hours of sleep-deprived programming, with the goal of creating a good tool to help other open source lovers to find projects to contribute.
CodeMill makes it dead simple to get your software development tasks done by members of the GitHub community. No interviews, no contracts, no hassle. Pay only for satisfactory delivery. Seemlessly integrated into your GitHub workflow.