BillGrid.com - BillGrid is an easy to use online invoicing, billing and expense management system that will save you time with tracking clients projects, expenses, invoices and payments.
TravelPerk - Corporate Travel Management
ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.
TravelBank - A modern travel, expense, and rewards app for SMBs.
Elorus - A super-easy online invoicing & time tracking software
Egencia - Egencia is a corporate travel management system.