JaamSim review

JaamSim earns its place as the best free option. It is open source under the Apache 2.0 license and offers a drag-and-drop interface with interactive 3D graphics, which is rare at no cost. Libraries cover graphics, probability distributions, basic objects, resources, process flow, calculation, fluid flow and submodels, enough to model a production line with stations, queues, breakdowns and shared operators. It runs on Windows, macOS and Linux, and JaamSim reports more than 10,000 downloads a year. The developers also claim it runs many times faster than commercial packages, which we could not confirm. The free version lacks the dedicated material flow, vehicle movement and transportation libraries; those are in JaamSim Pro, a commercial extension sold by inquiry. Support comes through a community forum, so teams that need training or guaranteed help should budget for Pro or a commercial tool. For a first throughput model or a teaching project, it is hard to beat.

Who it is for

Engineers, students and small manufacturers who want a free, capable discrete-event simulator without license fees.

Price

Free and open source under Apache 2.0; JaamSim Pro commercial extension priced by inquiry.

JaamSim is a free, open source discrete-event simulation software
Quoted from the vendor pricing page on November 10, 2026.

Key features

• Drag-and-drop user interface with interactive 3D graphics
• Object libraries for process flow, resources, probability distributions, calculation and fluid flow
• Input and output processing and model development tools
• Runs on Windows, macOS and Linux
• JaamSim Pro adds transportation, material flow and map libraries plus vehicle movement

Strengths and weaknesses

• Strength: No license cost, Apache 2.0 license
• Strength: Cross-platform
• Strength: Open source code that can be inspected and extended
• Weakness: Smaller object library for manufacturing equipment than commercial tools
• Weakness: Support relies on the community forum unless you buy Pro
• Weakness: Material flow and vehicle movement features are in the paid Pro extension

Key facts

• Price: Free
• License: Apache 2.0
• Platforms: Windows, macOS, Linux
• Downloads: More than 10,000 a year, according to JaamSim

Where it ranks

JaamSim is No. 8 in our Best Manufacturing Simulation Software verdict.