DevOps tools

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Project management

Issue Tracking

Issue Boards

Portfolio Management

Service desk

Source code management

Code Review

Web IDE

Wiki

Continuous Integration

Container Registry

Continuous Delivery/Deployment

Infrastructure Configuration

Application Performance Monitoring

Security Testing

License Management

BizOps Tools

Meltano is a separate product that isn't part of GitLab. Here's a list of BizOps tools. Other lists include cloud native ETL tools, and the Meltano README.