Renovate
A more configurable alternative to Dependabot — Rhys Arkins (now Mend, formerly WhiteSource), 2017. Runs as a GitHub App, GitLab integration or self-hosted.
Larger spec: groupings ("all minor bumps in one PR"), schedules, autoMerge for safe types, branchPrefixes, automatic rebases. Supports 70+ package managers (npm, Maven, Cargo, Helm, Terraform, Docker, GitHub Actions, etc.).
The default at teams that want automation beyond "just security alerts". Dependabot is simpler, Renovate is more capable but demands more JSON config.