Qt-based CRM (customer relationship management) software tools (only Windows platform). Projects of the Qt-based CRM application contain 65 forms and about 100 classes (without log4cplus). Technologies and tools: - C++11; - Visual Studio 2003; - Visual Studio 2017; - Qt3.3.5; - Qt5.12.2; - PostgreSQL 10/11; - log4cplus; Activity: - Converting (and refactoring) sources of the the Qt-based CRM from usage of Qt3.x api to Qt5.x api; - Optimizing for increasing of CRM tools performance; - Adding log4cplus support; - New small Qt-based admin tool has been developed;