Best open source alternatives to Office 365

Office 365 is a powerful product, but open source business productivity suites come cheaper

Microsoft's Office 365 suite still dominates the productivity landscape with more than 100 million monthly active users, but open source competitors abound

These productivity suites offer affordable alternatives to Office 365 and will constantly evolve due to continual improvement through open access to developers. The options available have improved markedly in recent years, with many including features that now compete with Microsoft.

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Additional reporting by Laurie Clarke