NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...
Mobbo - Mobbo provides analytical insights to benchmark, compare and optimize mobile apps,
ClearOS - A very good alternative for Windows Server, for free
ManyContacts - Create and install a Contact Form in minutes. Easily convert your website visitors into qualified leads. ManyContacts provides a FREE online contact form for conversion optimization.
Univention Corporate Server - Univention Corporate Server UCS with Active Directory functions and App Center is the cost-efficient and popular successor to Microsoft's server solutions.
Jungle Scout - Amazon product research made easy.