OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
Concur - Automated travel and expense management - your employees, travel managers and finance, too.
MAPS.ME - Fast, detailed and completely offline maps for mobile devices
AmTrav - AmTrav is a travel management solution that offers expense management integration, online booking tools to help booking process, travel consultant service, and more.
HERE WeGo - HERE WeGo - Maps - Routes - Directions - All ways from A to B in one
Tripcatcher - Tripcatcher is a mileage app to keep track of travel expenses.