The former king of open-source CI, now a paid platform with credit-based billing. While it still offers a clean configuration syntax, its high starting price and lack of free open-source tiers have caused a mass exodus to integrated tools like GitHub Actions.

A CI/CD platform historically favored for its strong Windows and .NET support. While reliable, its interface feels dated and its 'per-concurrency' pricing model ($50/mo for extra jobs) is far more expensive than modern credit-based alternatives.