Best Diagram Software for Redmine

Backlog is an effective collaboration and project management tool designed for teams aiming to enhance productivity, improve visibility, and streamline project tracking. It allows development teams to collaborate seamlessly with departments such as Design, Marketing, and IT to deliver high-quality projects more efficiently. Key features encompass Projects, Gantt Charts, Burndown Charts, Issues, Subtasking, Watchlists, Comment threads, Version control, File sharing, Wikis, and Bug Tracking. Additionally, users can conveniently update their projects while on the move using mobile applications for both iOS and Android platforms. This versatility makes it easier for teams to stay connected and manage their work from anywhere.

Astah Professional helps software teams design systems visually, before and while they write code. One application covers UML 2.x, entity-relationship diagrams, data flow diagrams, flowcharts, requirement diagrams, CRUD matrices, and mind maps, so architects and developers do not have to switch tools between notations. Diagrams in Astah are views of a shared model. When you rename a class or change a relationship, every diagram that contains it is updated automatically. For AI-assisted work, Astah Professional offers AI Chat Copilot and AI-assisted code reverse engineering, both of which connect to OpenAI, Azure OpenAI, Claude, Gemini, or any OpenAI-compatible endpoint through your own API key. A local MCP server lets external AI agents work with your Astah models. Conventional reverse engineering of Java, C#, and C++ code works without an AI service. The tool runs locally on Windows, macOS, and Linux and ships with its own Java runtime. Developer: Change Vision, Inc. Current version: 12.0 (July 2026). A 20-day free trial is available.

Astah UML gives software teams and students a focused tool for UML 2.x modeling. Class, use case, sequence, activity, state machine, component, and deployment diagrams are all available, together with mind maps for early brainstorming. Every diagram is a view of a shared model, so renaming a class or changing a relationship updates it everywhere it appears. For AI-assisted work, Astah UML offers AI Chat Copilot and AI-assisted code reverse engineering, both of which connect to OpenAI, Azure OpenAI, Claude, Gemini, or any OpenAI-compatible endpoint through your own API key. A local MCP server lets external AI agents read and work with your models, and conventional reverse engineering turns existing Java, C#, and C++ code into diagrams without an AI service. Astah UML runs locally on Windows, macOS, and Linux. Developer: Change Vision, Inc. Current version: 12.0 (July 2026). Students can use it free of charge, and a 20-day trial is available for everyone else.

Create complex diagrams using markdown code and collaborate in real-time with your team. Text-based diagramming simplifies documentation processes and improves workflows. You can create projects with the Teams feature and invite members. This allows sharing across your organization, ensuring a single source for truth and improving productivity. Mermaid Chart’s visual editor will take your diagramming to a new level. Mermaid Chart offers a 14-day trial of its newly-launched Pro tier. Text can be used to create complex visual diagrams. This is a more intelligent way to create diagrams. Add styling to your diagram with the init directive to align it with your project's colour scheme. Create a variety of charts and diagrams using Markdown code. Mermaid Chart allows you to share across your organization, ensuring a single source truth. This simplifies collaboration and enhances productivity.