GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
TravelPerk - Corporate Travel Management
Synder - AR Automation
TripActions - TripActions is the corporate travel management company that helps you control costs and keep employees happy.
Xero - Xero is online accounting for your small business.
TravelBank - A modern travel, expense, and rewards app for SMBs.