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InvoicePlane is a self-hosted open source application for managing your quotes, invoices, clients and payments. The application comes with various options, templates and settings to customize your invoicing experience.

Send, track and collect payments quickly. Great for teams, freelancers and service providers. FreshBooks is an easy cloud accounting app for small businesses and freelancers, specifically designed to save you time billing clients. Create professional invoices, capture expenses with ease and effortlessly track time on projects; it’s all here, plus you’ll be ready for tax time.

Invoice Ninja is a free, open-source solution for invoicing and billing customers. With Invoice Ninja, you can easily build and send beautiful invoices from any device that has access to the web. Your clients can print your invoices, download them as pdf files, and even pay you online from within the system.

Zoho Invoice is an easy invoice software meant for small businesses and freelancers. Accept payments online, automate payment reminders and recurring invoices easily.

FusionInvoice is an open source invoicing, quotes, and client management application built for freelancers and small businesses who need a simple, yet powerful self-hosted web based invoicing system. FusionInvoice is community driven so ideas/features, help/support and more is all provided by the project developer and various dedicated Fi users.

Billomat Online Invoicing Tool is a perfect choise for every freelancer and small bussiness even for non-accountants. The Billomat service include customer management, quotes, invoices and reminders and what is most important its stress-free and secure!

Super-simple invoicing. Create the invoice and print it.

Logic Invoice is an accounting & invoicing solution, which you can use to build websites and online applications. Best of all, Logic Invoice is an open source project, allowing everyone to freely access the source codes and make their own customisations.

invoicely is a free, powerful online billing and invoicing platform for small-to-medium size businesses and freelancers. Used by over 100,000 businesses worldwide, invoicely makes it easy to send, manage, and track invoices, estimates and bills through a simple, easy-to-use interface. Besides managing invoices, invoicely supports a multitude of features including time and expense tracking, recurring invoicing, team management and direct online payments on invoices.

Hiveage, formerly CurdBee, is an invoicing and billing online software for freelancers and small businesses.

Invoicera is an online billing software which is specifically designed keeping simplicity and online invoicing convenience in mind, while at the same time offering the best of the breed invoicing features.