The Open Source ERP is a web based.
The ERP server software runs on Linux. The ERP need no plugins in the browser on the client computer. The ERP can be accessed from any where with out effort. Be it at home with your home computer (Windows, Linux, MAC OS X), or traveling with your smart phone (iPhone, iPad, Android), or in the office, the data is always at hand.
Webdav interface and Active Sync for synchronizing contacts and time management.
Free & Open Source Invoice App for Freelancers & Small Businesses
Crater is an open-source web & mobile invoicing app made especially for freelancers and small businesses. It's the complete invoicing solution you need, allowing you to track expenses and payments, calculate taxes, and create estimates and invoices. As both a web and a mobile app, Crater allows you to manage your invoices and keep track of everything even on the go. Crater's web application is made with Laravel & VueJS, while the mobile apps are built using React Native.
Crater is a...
Keep track of all your job costs, make sure you don't lose money
Book a Job Card, assign employee which records the time spent on the job that transfers to a timesheet, add costing like materials from built-in inventory system. Finally create invoices integrating with XERO online accounting or print PDF invoice.