The best open source alternative to Remote Desktop Connection is RustDesk. If that doesn't suit you, our users have ranked more than 100 alternatives to Remote Desktop Connection and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Remote Desktop Connection are Remmina, mRemoteNG, TightVNC and UltraVNC.
Remote Desktop Connection alternatives are mainly Remote Desktop Tools, but if you're looking for
SSH Clients or Video Calling Apps you can filter on that. Other popular filters include
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EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Remote Desktop Connection.
I've been using Remote Desktop Connection (Manager) for years as a Windows user. Remmina seems like the most popular alternative for Linux, and honestly, it works. The interface isn't quite as simple as it seems to support a lot more, but I had it up and running in a couple of minutes.