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Top Rated Calendar Software with Open source - Page 12

Last updated: September 2026

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384 software options

Sage HR logo

Manage and engage your workforce wherever they are

Who’s off and when? Who’s available? Productivity soars and confusion bids good-bye with the flexible Sage HR calendar.

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Engageware logo

Intelligent Online Appointment Scheduling Software

Engageware Scheduler is the world’s leading Intelligent Online Appointment Scheduling solution – serving businesses of all sizes – from the world’s largest retail, banking and technology organizations to thousands of small and midsize businesses.

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Salon Booking System logo

Appointment booking WordPress plugin

Salon Booking is a complete and easy to manage appointment booking system for WordPress-based salon, spa, beauty center, and barber websites

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SocialSchedules logo

Scheduling software for businesses with hourly employees

SocialSchedules is a free scheduling solution for hourly employees. Build the schedule in minutes, make changes to it easily and send it to your team in a click. Free iOS & Android apps mean you can edit & check the schedule on the go + your employees always have the most updated version.

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Deltek Replicon Time Tracking logo

Cloud-based project time tracking platform

Replicon Time is a leading cloud-based project time tracking platform that helps mid-market and enterprise organizations manage time, projects, and workforce operations with accuracy and confidence.

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Bookeo logo

Online scheduling and reservation system

Bookeo is an online scheduling and reservation system that helps businesses fill up the appointment book. Managers can accept online bookings and payments 24/7, directly from the website and Facebook page. Bookeo will send an automatic booking confirmation and reminder. It also offers advanced tools to increase sales, such as gift vouchers, promotions and prepaid packages.

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Ontraport logo

Sales, marketing, and communication management software

Ontraport helps businesses streamline sales, marketing, customer communication, and other operations on a unified portal. The marketing automation tools let organizations create, run, and manage marketing campaigns using customizable templates and send targeted emails or text messages to customers.

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Apollo.io logo

Cloud-based B2B AI sales platform for all team sizes

Cloud-based B2B sales intelligence platform with a 240M+ contact database, multi-channel outreach, and AI-driven engagement tools.

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Setster logo

Online appointment scheduling software and API

Setster offers its own calendar, but can integrate with any online calendars for a seamless workflow.

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ScheduleFlex logo

Smarter workforce scheduling

Shiftboard is the leading provider of workforce scheduling software. Thousands of customers choose Shiftboard to help lower labor costs, increase worker productivity, and decrease employee turnover.

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Booksy Biz logo

Appointment scheduling and facility management tool

Booksy Biz is a business management platform designed to streamline and optimize operations for service-based businesses. The platform offers a suite of features to help owners and professionals manage day-to-day activities with ease. At the core of Booksy Biz is its powerful calendar management system. Users can personalize calendars with color-coding and drag-and-drop functionality, while also taking advantage of automated waitlists to fill unexpected openings.

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Kickserv logo

Field service management software for service professionals

Kickserv has 4x Unique Calendars. Our powerful calendars and scheduling features can help teams plan for even the most complex schedules.

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eSPACE logo

Facility management software for churches & schools

eSPACE Event Scheduler is designed for churches & schools, providing seamless scheduling, real-time conflict detection, customizable bookings, and IoT integration for HVAC & security. Supports unlimited users with competitive pricing for efficient facility coordination.

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TimeClock Plus logo

Accurate time tracking for better bottom lines

With automated time tracking, easy leave and accrual management, and comprehensive compliance management, TimeClock Plus by TCP simplifies even the most complex time and attendance needs. From avoiding payroll mistakes and controlling labor costs, to adhering to labor laws and regulations.

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Cirrus Insight logo

#1 App for Salesforce Productivity & Meeting Automation

AI-powered CRM automation that builds pipeline, manages deals, and keeps your sales engine running directly from your inbox.

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When I Work logo

Staff scheduling, time tracking, and communication tool

Use When I Work to schedule, track time and attendance, and communicate with employees, all in one place. Create schedules quickly and easily, and send the schedule to staff with just a click. Save time. Improve accountability. 14-day free trial.

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Ganttic logo

Fully customizable project resource planning solution

Ganttic is a visual resource calendar for managers outgrowing spreadsheets. Build a custom data schema to track people and equipment on one timeline. Features bidirectional Google/Outlook sync, API flexibility, and SOC-compliant security. Scale to 5,000+ resources with enterprise-grade command.

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Asana logo

Project tracking and workflow management platform

Asana Starter Plan provides growing teams with project management tools to track progress and meet deadlines. The plan includes workflow automation features, custom project templates, forms for standardized work requests, and rules for routine task management. It also offers visualization tools like Gantt and timeline views, plus AI-powered features for status updates and project organization.

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ShiftWizard logo

Cloud-based nurse and healthcare scheduling solution

ShiftWizard is a cloud-based nurse scheduling solution that enables healthcare organizations to streamline processes related to staff management, employee communications, incentives, shift swapping, and more.

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HotSchedules logo

Conquer Every Shift with HotSchedules, Powered by Fourth

HotSchedules is an employee scheduling tool for managing & communicating with workforces, as well as forecasting sales, generating reports & sourcing new staff for restauranteurs, hoteliers, and retail operators.

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Humanity Schedule logo

Dynamic employee scheduling that works for everyone

Flexible scheduling that automates shift planning, reduces conflicts, and keeps teams organized.

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TrackTik logo

Security Workforce Management Software

TrackTik’s integrated security workforce management software offers security service companies complete control of every aspect of their business.

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Upper Hand logo

Innovative sports and fitness software

Upper Hand has the industries first calendar to overlay program, staff, and resource availability on one calendar - giving owners and admins instant access to True Availability. Easily toggle between different staff and resources, save new views, and set default views.

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Podio logo

Cloud-based tool for collaborating on and managing projects

Podio is a business software that helps teams work together more effectively. It provides a centralized platform for managing projects, tasks, and communication. Podio caters to a range of industries, including accounting, real estate, and marketing agencies, enabling teams to streamline their workflows and boost productivity.
A tool that your team will love to use, that's entirely customizable to suit how you run projects most efficiently.

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Pike13 logo

Scheduling, payments, and skill tracking for growing needs

Mobile-friendly, cloud-based all-in-one scheduling software for recurring appointments/classes. Check-in, billing, merchant processing, reporting, payroll and more.

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