TurnKey GNU/Linux: 100+ free ready-to-use system images for virtual machines, the cloud, and bare metal.

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In my experience, the best source for appliances is TurnKey Linux

I-Programmer (source)

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100+ ready-to-use solutions: discover and leverage the best free software. Deploy solutions quickly on bare metal, virtual machines, or in the cloud.
Free as in speech: free software with full source code and a powerful build system. Free of hidden backdoors, free from restrictive licensing and free to learn from, modify and distribute.
Secure and easy to maintain: auto-updated daily with latest security patches.
1-click backup and restore: smart backup software saves changes to files, databases and package management to encrypted storage which servers can be automatically restored from.
It just works: designed for ease of use, built and tested collaboratively by the community.

Read more about Benefits

Turnkey GNU/Linux is a free Debian based library of system images that pre-integrates and polishes the best free software components into secure, easy to use solutions.

TurnKey is inspired by a belief in the democratizing power of free software, like science, to promote the progress of a free & humane society. Without the freedom to freely distribute, tinker and learn from free software the Internet as we know it would not exist. Free software is the silent, often invisible power behind the greatest technological marvel of our era.

At the time of writing Debian, the largest GNU/Linux distribution has over 37,500 packages in its software repositories. The free software movement has collectively created a treasure trove of software that anyone is free to use, distribute, modify and learn from.

Unfortunately, much of this treasure is locked away because too few know about it and even fewer have the skills to take full advantage of it. Imagine how much good we could do if changed that. That's our vision and we invite you to join the mission.