Odoo is an all-in-one management software that offers a range of business applications that form a complete suite of enterprise management applications.

InvoicePlane is a self-hosted open source application for managing your quotes, invoices, clients and payments.

Nukern is a billing software in the cloud, specialized for web hosting companies. It automates the recurring invoices and the entire life cycle of web hosting…

Vosae is an invoicing, organizer, contacts app.

BILLmanager is an all-in-one web hosting billing software.

InvoiceBerry offers online invoicing & expense tracking for small businesses, freelancers and sole traders.

TimeCamp is an advanced time-tracking app which also offers a variety of reporting, billing, and invoicing features.

Ubersmith is the leading subscription business management suite, including usage-based billing, quoting, provisioning and related software.