SlickPie!

GnuCash is personal and small-business financial-accounting software, freely licensed under the GNU GPL and available for GNU/Linux, BSD, Solaris, Mac OS X and Microsoft Windows.

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.

BILLmanager is a linux-based control panel for automating client management, invoicing and billing. This software specifically developed for hosting service providers will help you manage and take complete control of various aspects of your business:

Paymo is an online project management application that helps you deliver projects on time and on budget by eliminating bottlenecks through accurate time tracking & reporting.Paymo can help you with task management & collaboration, time tracking, invoicing, estimates & expenses.

ZipBooks allows contractors and small businesses to send quotes and invoices to potential customers or paying clients. Create a project with ZipBooks and track the time, products, and expenses of your work. Once you are ready to send an invoice to a client, ZipBooks automatically detects unbilled activity and allows you to include any or all of the billing details. You can customize the rate of each of your team members, whether to include an attached PDF, and even add your own logo to invoices. Because we make money if you use our credit card payment partners, ZipBooks is 100% free, forever. We will never spam you, show you ads, sell your information, or watermark your invoices. »

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.

FrontAccounting is a simple, but powerful, system for the entire ERP chain and covers:

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

Crunched is a new smart cloud accounting software that helps you easily manage your checkbook, send invoices, collect payments and seamlessly manage your bookkeeping. By utilizing professional accounting techniques and new automated technologies, Crunched is ready for your business. Crunched offers an updated modern design and error proof posting so accounting mistakes are no longer an option.

Saasu.com online accounting - online accounting. Invoicing, payroll, purchases, reporting, bank feeds

Sage 50 Accounting, previously Peachtree or Simply Accounting for Canada, delivers the efficiency your business requires whether you're after rapid expansion, steady growth, or maintaining stability. This comprehensive solution lets you easily manage customer contacts and sales, customize inventory and vendor management, automate purchasing and shipping, track jobs and projects, and more!