Bludit - Bludit is a web application to build your own website or blog in seconds, it's completely free and open source. Markdown support.
OnPay - Payroll and HR that make business a breeze
Grav - The modern open source flat-file CMS
Viventium - Viventium is a cloud-based payroll and human resource software solution designed for small to midsize businesses.
HTMLy - HTMLy is an open source databaseless blogging platform. A Flat-File Blog and Flat-File CMS written in PHP prioritizes simplicity and speed.
Tribe HR - The best Online Human Resources Software for small & medium businesses, simplifying frustrating HR management challenges.