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

Plone

Open Source Content Management

PunBB

Forum software

TKLDev

TurnKey Development Toolchain and Build System

Sahana Eden

Humanitarian platform

Gallery

Photo Album Organizer

SilverStripe

CMS and framework

eZ platform

Enterprise Content Management System

Kliqqi

Social publishing CMS

Etherpad Lite

Real-time document collaboration

Matomo (formerly Piwik)

Self Hosted Real-Time Web Analytics

Elgg

Social networking engine

e107

Content Management system

phpList

Email campaign management

CouchDB

JSON based Web database

PhreeBooks

Enterprise Resource Planning

TWiki

Enterprise Wiki Platform

Concrete5

Next generation Content Management System

Vanilla forum

Community forums evolved

ProjectPier

Easy Online Collaboration

Collabtive

Open Source Project Management

Ushahidi

Crowdsourcing Crisis Information

Symfony

PHP Web Framework

Mumble Server

the open source VoIP solution

Nextcloud

Share files, music, calendar

Mayan-EDMS

An electronic vault for your documents

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.