Invoicebus!

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.

The most popular version of Americas #1 small business financial software helps make your business more profitable.

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.

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.

Online invoicing, client management, and time tracking web application for freelance, creative professionals, and small businesses.

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

Invoiced is simple invoicing for freelancers and small businesses. We allow businesses to accept online payments in just a few clicks. Our focus is helping businesses get paid on time. In order to achieve this we built an entire workflow around invoicing that ensures customers will receive their invoices while making it easy for them to pay. Invoiced keeps you focused by tracking who owes you money.

Billbooks is a new cloud accounting app for sending instant invoices and estimates to your clients. Customize columns, Manage expenses, send auto payment reminders, Keyboard shortcuts and way too many productive features.

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.

InvoiceBerry is an online invoicing software for small businesses and freelancers. The software is web-based and was designed with simplicity and ease of use in mind. Businesses can create, send and manage their invoices and quotes from anywhere in the world. The software also provides an expense, payment and invoice reminder function.

Invoice Dude is a free online billing an invoicing application which lets you send invoices to clients easily.