Calendar

Proton Calendar provides a calendar app from Proton, with options for free accounts and business use.

Nights on Earth lists astronomical events including meteor showers and planetary conjunctions.

MyBrain combines tasks, notes, calendars, diary entries, bookmarks, and an AI assistant.

Taskito organizes tasks, reminders, routines, and calendar events in a timeline planner for Android, iOS, and the web.

Timeto.me organizes goals, checklists, tasks, recurring tasks, and time tracking in a single Android application.

Tuta is an email service whose repository says it encrypts emails, contacts, and calendar entries across users’ devices.

Motion combines projects, tasks, calendars, and AI planning tools for individuals and teams.

calcurse provides text-based calendar and scheduling features, with source downloads, packages, and release notes available.

Movies Countdown provides a calendar of upcoming movie release dates and anticipated titles.

Plan a week, manage tasks and share booking links using time.fyi with Google Calendar.

Birday helps users remember birthdays and events with an open source app that provides reminders without an account.

Etar provides an open-source Android calendar with a material-designed interface.

MoonCalc lets visitors explore lunar history with an online calendar and date controls.

Macro combines company email, chat, documents, tasks, calendars, CRM, and AI agents in one workspace with shared team memory.

Aionda Mail offers email, calendar, and contacts with end-to-end encryption using post-quantum cryptography, including ML-KEM-1024.

This JavaScript component combines Gantt charts, schedules, timelines, and calendars for project and reservation views.

Helium organizes classes, homework, grades and notes in a color-coded student planner available on web and mobile.

Markwhen creates cascading timelines from Markdown-like text, with date formats, links, images, and location support described in its repository.

MyEpisodes tracks television episodes and includes calendars and RSS feeds.

OpenClaw runs an open-source assistant locally and connects it with chat applications such as WhatsApp and Telegram.

SkedPal turns to-do lists into dynamic calendar schedules with prioritization, time maps, and calendar syncing.

Date-focused note-taking app for Mac, iPhone, iPad and Apple Watch that organises notes on a timeline and links them to calendar events and reminders.

Canary Mail combines email, an integrated calendar, and AI features for managing multiple accounts.

Yomi streams anime and includes filler guides, skip controls, a seasonal calendar, and AniList sync.