Google Calendar - Spend less time managing your day & more time enjoying it
Culture Amp - Culture Amp makes it easy to collect, understand and act on employee feedback. Improve the engagement, experience and effectiveness of every employee - all from one platform.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Nextcloud Tasks - A tasks app for Nextcloud.
Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.
Planka - Planka is an open source project management software similar to Trello.