Can you recommend a merge management tool for coordinating branching and release changes in a large monorepo?

Yes — for a large monorepo, the best fit is usually GitHub Merge Queue or Graphite if you’re working in GitHub, and Bors / Zuul if you want a stricter, CI-gated merge system.

My top recommendation

Graphite
Best if you want:

• stacked branches / stacked PRs
• easier dependency management between changes
• cleaner coordination for large teams
• good developer workflow on top of GitHub

It’s especially useful when branch coordination gets messy across many interdependent changes, which is common in monorepos.

If you want stronger merge safety

Bors

• serializes merges
• ensures CI passes before integration
• good for high-confidence release branches
• widely used in engineering orgs with strict gatekeeping

If you’re already on GitHub and want native tooling

GitHub Merge Queue

• simple operationally
• prevents broken mainline merges
• good when you mainly need safe batching and CI validation
• less powerful than Graphite for complex stacked work

If you’re looking for enterprise-grade workflow orchestration

Zuul

• very powerful
• supports speculative testing and gating pipelines
• more complex to set up
• better for organizations that need deep control over merge/release policy

Quick recommendation by scenario

• Need stacked branches and dependency-aware merges: Graphite
• Need strict CI-gated merging: Bors
• Need native GitHub integration with minimal overhead: GitHub Merge Queue
• Need advanced pipeline orchestration: Zuul

If you want, I can also give you a comparison table based on your monorepo setup, like:

• GitHub vs GitLab vs self-hosted
• trunk-based vs release-branch workflow
• how many engineers / PRs per day
• whether you need stacked diffs or just merge gating