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WebApp oftware in PHP MySql preferred Yii framework using plugins, bootstrap/booster
Multi login/register with popular engines
Users: simple user hierarchy - 3 levels - admin, manager and customers
Modules: Calendar, History of services with configurable fields
Simple graphic, will provide logo and general layout
Database: relational, will provide help in creating/organising
Feel free to inovate a bit, simple project but can be challenging if expands