Best Open Source ERP Software (2026)

It's ERP software whose source code is publicly available, meaning your team or a hired developer can inspect, modify and extend it rather than being limited to what a vendor's settings allow. Some open source ERP projects are entirely free to self-host; others offer a free core with paid enterprise modules or hosted plans. Either way, the appeal is control — over data location, customisation depth, and long-term cost as you add users, since licensing usually isn't per-seat the way commercial ERP often is.

• Active development community — recent updates and a responsive community matter more than the feature list on day one
• Modular architecture — ability to add only the modules (inventory, accounts, HR) you actually need
• Indian localisation — GST, e-invoicing and Indian accounting rules should exist as a maintained module, not something you build yourself
• Hosting flexibility — self-host, or use the project's own cloud-hosted version if you don't want to manage servers
• Data export and standard formats — so you're not locked into one implementation partner
• Available local implementation partners — for support beyond community forums
• Security update cadence — check how quickly vulnerabilities are patched
• Documentation quality — thin documentation means every customisation costs more developer time

Get a realistic estimate of implementation and hosting cost from a local partner — self-hosting isn't free once you count server costs, security patching and someone's time to maintain it. Confirm Indian GST and e-invoicing support is actively maintained, not a stalled community module. Ask how upgrades work, since heavily customised open source ERP can become hard to upgrade if customisations aren't kept separate from the core code. If you don't have in-house technical staff, budget for an implementation partner rather than assuming DIY.

Ask a potential implementation partner to show a live installation with Indian GST configured, not just the generic global version. Ask what ongoing cost looks like across hosting, support and future customisation, and compare that honestly against a subscription ERP's per-user price at your team size. Check the size and activity of the user community for the specific project, since a quiet project means slower bug fixes. Confirm what happens if your implementation partner is no longer available — can another firm pick up the codebase?