SAP Concur.

Travel and expense management (US-operated)

Facts

SAP (EU)
German enterprise ERP and business software
DE · commercial
↗
Visma
Nordic enterprise software group.
NO · commercial
↗
ERPNext (self-host)
Open-source ERP; self-hostable in EU
EU · open-source
↗
Invoice Ninja
Open-source invoicing and payment platform with European hosting option
NL · open-source
↗
Kimai
Open-source time tracking application with invoicing integrations
DE · open-source
↗
Kivitendo
Open-source ERP system for accounting and goods management, popular in Germany
DE · open-source
↗
Odoo
Open-source suite of business apps including ERP, CRM, accounting and HR
BE · open-source
↗
24SevenOffice
Norwegian cloud-based ERP platform for accounting, CRM and project management
NO · commercial
↗