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.
WonderCMS - WonderCMS is the smallest flat file CMS. Completely free, open source, privacy oriented for over 12 years.
Tribe HR - The best Online Human Resources Software for small & medium businesses, simplifying frustrating HR management challenges.
HTMLy - HTMLy is an open source databaseless blogging platform. A Flat-File Blog and Flat-File CMS written in PHP prioritizes simplicity and speed.
OnPay - Payroll and HR that make business a breeze