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Open Source Calendar Software (2026)

Last updated: March 2026

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9 software options

Connecteam logo
Category Leaders

Enhance employee management with the only all-in-one app

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Open Source
Basic - from $29/month (billed annually) or $35/month (billed monthly) Advanced - from $49/month (billed annually) or $59/month (billed monthly) Expert - from $99/month (billed annually) or $119/month (billed monthly)

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mHelpDesk logo

Cloud-based field service management software

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Open Source
Please contact mHelpDesk for pricing details.

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ONLYOFFICE Workspace logo

Secure collaborative online office

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Open Source
Take your business to the cloud at the best price. 30-day free trial. No credit card required. You can choose 1-month, 1-year, or 3-year subscription. The subscription plan for ONLYOFFICE is based on the amount of active portal users, e.g. $40 per month (if monthly commitment) for 6-10 active users, what means $5 per user/month on average. If you pay for a year or for 3 years, the price per user/month will be even lower - $3 and $2 on average respectively. Note that subscription plans for 1-2 and 3-5 active users are available for annual subscribers only. Nonprofit organizations and schools can use ONLYOFFICE cloud service for free, while other educational institutions can get a discounted rate.

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Verizon Connect logo

Fleet tracking intelligence and management software

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Setster logo

Online appointment scheduling software and API

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Open Source
https://www.setster.com/pricing

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BNC IBIS logo

Cloud CRM for selling on construction projects.

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Open Source
BNC offers its services based on Corporate Subscriptions Packages. We have business intelligence packages to suit every budget and will be pleased to provide you with a proposal based on your project intelligence and project-sales process automation requirements.

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IntraHub logo

Project management tool with time tracking and data security

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Prolyncs logo

Prolyncs | Online Appointment scheduling software

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IntraMail logo

Software for managing and responding to emails

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