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Best Free and Open Source Alternatives to Google Calendar

Google Calendar is a time-management and scheduling calendar service developed by Google. We recommend open source alternatives.

sabre/dav is a popular WebDAV framework for PHP. Use it to create WebDAV, CalDAV and CardDAV servers. Free and open source software.

Hestia Control Panel is designed to provide administrators an easy to use web and command line interface.

Ajenti 2 is a modular server admin panel with a nice interface and a better architecture, developed with Python3 and AngularJS.

YTalk is in essence a multi-user chat program supporting both talk and ntalk protocols.

utalk is a one-to-one text chat program alternative to the Unix ‘talk’ client, which uses a more responsive protocol built over UDP (instead of TCP).

ntalk is a chat application. It is designed to be much more friendly than Unix talk and provide a nice console interface.

Qosmic is a cosmic recursive flame fractal editor. It’s written in the C++ programming language and published under an open source license.

JWildfire is a very powerful and flexible flame fractal generator that has been battle-tested by numerous fractal artists.

ttyper is a terminal-based typing test. It supports a good range of languages including English, German, Norwegian, Ukrainian, and Spanish.