David Schneider's excellent script to install complete GNU/Linux environment(s) as chroot(s) inside Chrome OS (or Chromium OS) with "developer mode" enabled. Supported distros include: Debian, Kali & Ubuntu
Open-source server applications packaged as self-contained Linux software appliances. Selection includes many development frameworks, webapps, and content management systems. Packages are available as virtual machine images or ISO disc images, allowing for implementation using software-as-a-service, a local virtual machines, or hardware installation.
Open-source server application packages for deployment as appliances (e.g., virtual machines) or sandboxed local installation on Linux, OS X, or Windows. Smaller application downloads are available to pair with LAMP, LAPP, and Ruby base stacks. Handy for test-driving applications.
A free (libre), open-source (GNU LGPL) web-conferencing system developed with support from the Mozilla Foundation's WebFWD project. Designed for online education, BigBluebutton provides voice- and video-conferencing capabilities that include conference recording, presentation uploads, virtual whiteboard, and simultaneous webcam users.
The BigBlueButton server runs on Linux, but virtual machine images are available for running the server on other platforms.