VirtualBoxImages is described as 'VDI images of pre-installed "Open Source" Operating System distros. Pre-installed virtualbox images ready for you to explore and play with. Here you will find linux vdi image downloads of many of the popular Linux distributions'. There are four alternatives to VirtualBoxImages for Windows, Linux, Mac and Online / Web-based. The best alternative is BitNami Application Stacks, which is both free and Open Source. Other great apps like VirtualBoxImages are Windows Subsystem for Linux (WSL) (Free), Virtual Machines (Free, Open Source) and OSBoxes (Free).
BitNami Stacks make it incredibly easy to deploy your favorite open source software. BitNami Stacks include an open source application and all of the other software necessary to run it, such as Apache, MySQL, PHP or Ruby.
The Windows Subsystem for Linux (WSL) is a new Windows 10 feature that enables you to run native Linux command-line tools directly on Windows, alongside your traditional Windows desktop and modern store apps.
The idea is to simplify developers configuration work through lightweight and powerful environments in order to help them to devote more time to their passion: the code. Moreover, it can be interesting for Linux and virtualisation enthusiasts.