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Professional open-source project scheduling and resource management for desktop and cloud.

GanttProject is a robust, desktop-based project management application that has evolved significantly into the 2026 landscape. Built on a Java-based architecture, it provides a high-performance alternative to Microsoft Project for users requiring local-first data sovereignty and offline-capable scheduling. The technical core focuses on Work Breakdown Structure (WBS) management, allowing for complex task hierarchies and critical path analysis through its integrated PERT chart engine. As of 2026, GanttProject maintains a unique market position by offering seamless interoperability with legacy enterprise formats (.mpp) while introducing a hybrid synchronization layer via GanttProject Cloud. This enables teams to combine the security of local file storage with the collaborative benefits of modern SaaS. Its architecture supports extensive resource leveling, custom holiday calendars, and advanced dependency mapping (Finish-to-Start, Start-to-Start, etc.). For Lead Architects, it serves as a reliable, cost-effective tool for technical roadmapping and resource allocation without the overhead of enterprise subscription models, making it a primary choice for engineering-focused teams and independent consultants.
GanttProject is a robust, desktop-based project management application that has evolved significantly into the 2026 landscape.
Explore all tools that specialize in manage project resources. This domain focus ensures GanttProject delivers optimized results for this specific requirement.
Explore all tools that specialize in critical path analysis. This domain focus ensures GanttProject delivers optimized results for this specific requirement.
Automatically identifies the sequence of tasks that determines the project duration using the CPM algorithm.
Native support for reading and writing .mpp and .xml formats compatible with Microsoft Project 2013-2024.
Dynamic histograms that track resource utilization across multiple parallel tasks.
Automatic transformation of Gantt data into a Program Evaluation and Review Technique network diagram.
Snapshotting feature that records the project state at a specific point in time for variance analysis.
Support for remote file storage protocols, allowing projects to be hosted on private servers.
Granular data extraction of tasks, resources, and assignments for further processing in Excel or BI tools.
Ensure Java Runtime Environment (JRE) 11 or higher is installed on the host system.
Download the platform-specific installer (MSI for Windows, DMG for macOS, or DEB/RPM for Linux).
Launch GanttProject and configure Global Settings including default UI language and currency.
Initialize a new project file (.gan) and define project properties including start date.
Configure the Project Calendar to include specific working days and public holidays.
Build the Task Hierarchy (WBS) by adding tasks and nesting them into logical groups.
Define task durations and set up dependencies by dragging connectors between Gantt bars.
Populate the Resource Chart by adding human resources and defining their roles.
Assign resources to tasks and review the Resource Load chart for overallocation.
Generate a Baseline to track project progress against the original schedule.
All Set
Ready to go
Verified feedback from other users.
"Highly praised for being a free, capable alternative to MS Project, though users note the Java-based UI feels somewhat dated."
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