Weblocks is open source software with a license of GPLv3. It uses Phalcon, a PHP framework, and uses JQuery and Bootstrap for its user interface. DB uses MySQL. You can build a web application by selecting functions. The functions that can be selected are schedule sharing, document sharing, workflow, etc. and can be created additionally. Even when creating additional functions, it can be created relatively easily by calling the API provided by Weblocks.