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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.

HomeBank is a free software. Use it to manage your personal accounts. It is designed to easy to use. Analyse your finances in detail using powerful filtering tools and graphs.

Mint.com is a free web-based personal financial management service for the US and Canada.

KMyMoney is a personal finance manager for KDE. It enables users of open source operating systems to keep careful track of their personal finance by providing a broad array of financial features and tools.

The suite of applications Stoq is an innovative set of business management applications available as free and open source software.

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.

CountAbout is a personal finance website. Import your Quicken or Mint.com accounts, categories and transactions and pick up with CountAbout where you left off with Quicken or Mint.com.

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.

Gnuaccounting is a Free Java cross-platform accounting and bookkeeping application.

TurboCASH Accounting Free and Open Source Accounting Software for Small to Medium Business.