Open Source Kotlin Scheduling Software

KashCal is a privacy-focused Android calendar application that brings personal, family, and work schedules into one interface. It synchronizes directly with iCloud, Nextcloud, Fastmail, Zoho, and other CalDAV-compatible servers. Users can also view and edit Google, Outlook, and other calendars connected through Android's system calendar. ICS subscriptions provide access to holidays, school schedules, and public events. CardDAV integration enables two-way contact synchronization, including photographs. Birthdays and anniversaries can be displayed automatically from contact information. Full-text event searching, home screen widgets, and individual event time zones simplify scheduling. KashCal works offline and protects credentials through Android Keystore encryption without requiring an account or collecting analytics.

The most handy calendar out there. Manage your events and reminders easily. Simple Calendar Pro is a really flexible calendar with many event related options. It offers powerful repetition rules, optional CalDAV synchronization, ics file handling and much more. Top notch design ensures the best possible user experience. You will get familiar with it really quickly. You can create new events really quickly by predefining default values, or by duplicating existing events. There are many views you can choose from, depending on your preference. No matter if you want to see just 1 day or 1 year, this app supports it. Personalize your experience by changing any app color. You can even change the apps' icon color to make sure it matches your home screen. The Pro one already has many new features including time zone support, attendees and email type of reminders in CalDAV synced events, then many other bugfixes and stability improvements.

DAVx⁵ is a free, open-source Android synchronization application designed to connect calendars, contacts, and tasks with compatible online services. It uses CalDAV and CardDAV standards to synchronize personal information between Android devices and remote servers. The application integrates with Android's account and synchronization infrastructure, allowing information to appear in compatible calendar, contact, and task applications. DAVx⁵ supports self-hosted services and providers such as Nextcloud, ownCloud, and other standards-compliant servers. It also provides WebDAV file access through Android's Storage Access Framework. Automatic configuration simplifies account setup and resource discovery. Its privacy-focused architecture gives users flexibility in choosing where their personal information is stored and synchronized.

This app was created to remember and manage events in a simple and effective way. The app contains some basic personalization options and an introduction, plus some new resources like animated vector drawables and the automatic dark/light theme. Support and updates are guaranteed. Birday allows you to import birthdays directly from your contacts, with a simple favorite system and a set of stats to discover.

A beautiful material calendar with endless scroll, range selection, and a lot more. A light, powerful and easy-to-use Calendar Widget with a number of box features.

Flux is an Android productivity application that combines notes, tasks, journals, habits, and events in customizable workspaces. It allows users to create dedicated spaces for different projects, routines, and personal activities. Flexible templates help organize information according to individual workflows. Its Markdown editor supports formatted text, code blocks, tables, mathematical expressions, and Mermaid diagrams. Task management includes recurring activities, reminders, progress tracking, and completion statistics. Daily journals provide space for reflections and longer written entries. An integrated calendar organizes events and important dates, while habit analytics visualize progress over time. Media attachments enrich notes with images. Built with Kotlin and Jetpack Compose, Flux uses local storage, optional biometric protection, and Material 3 customization.

Fossify Calendar is a privacy-focused Android calendar designed for managing appointments, events, and daily schedules without advertisements or tracking. It allows users to create events with configurable times, durations, reminders, and advanced recurrence rules. Calendar synchronization works with services such as Google Calendar, Outlook, Nextcloud, and Exchange through compatible Android calendar accounts. Users can switch between daily, weekly, monthly, yearly, and event-based views. Its reminder system supports custom sounds, vibration patterns, and looping audio alerts. Birthdays, anniversaries, and holidays can be imported into the calendar. Customizable home screen widgets provide convenient access to upcoming events. The application also offers event filtering and Material Design themes.

TimePlanner is an Android productivity application designed for scheduling daily tasks and tracking how time is spent. It provides agenda and timeline views for organizing activities with precise starting and ending times. Tasks can be categorized, prioritized, rescheduled, and stored in an inbox when no time has been assigned. Recurring templates automatically generate schedules based on flexible repetition rules. Notifications remind users before tasks begin, when they start, and shortly before they finish. Its analytics dashboard tracks planned versus completed time, workload patterns, and productivity trends. Users can set duration-based or task-count goals with deadlines. A Material 3 interface provides customizable themes, widgets, and accessibility settings.