YetiForce is a CRM and ERP system from Poland, written in PHP and originally forked from Vtiger CRM. It consists of modules for marketing, sales, projects, support, finance including invoicing, logistics, HR and reporting, and can be adapted with custom modules. A marketplace offers add-ons. YetiForce is offered as a cloud service (YetiForce Cloud), but the software can also be downloaded and installed on your own servers, with support and implementation services available from the vendor.
The service is provided by Stohid Technology S.A. in Warsaw, Poland. According to its terms, YetiForce Cloud runs on servers of Atman sp. z o.o. in a data centre in Warsaw, with backup copies kept in case of a failure there. The source code is public on GitHub; the licence terms are in the repository's LICENSE file and are worth reading before use. Both the vendor and the cloud service fall under Polish, and therefore European, jurisdiction, while self-hosting gives full control over the data.