The "world's leading web-based open source ERP," Openbravo tries to make ERP functionality accessible to companies of all sizes. It integrates with Openbravo POS, and you can find a range of add-ons for specific industries through Openbravo Exchange. Although the Web site pushes the commercial editions of Openbravo products, you can still download the source code for free. Operating System: Windows, Linux, OS X.
Unlike most ERP apps which are designed primarily for large enterprises, this ERP/CRM/eCommerce app is specifically aimed at small to midsize companies. Its modular design helps make it very customizable. Note: Although the application is available in English, much of the documentation is in French or badly translated English (for example, the word for "server" gets translated as "waiter"). Operating System: Windows, Linux.
You can protect your small business network without spending a lot of money by installing Endian on an older PC to create your own gateway security appliance. It includes firewall, antivirus, anti-spam, content filtering, VPN, proxy server and other capabilities. Endian also sells pre-configured appliances that come with support and additional features. Operating System: Linux.
Like Endian, Untangle comes in a free "Lite" version that allows you to make your own security appliance. It also comes in a number of commercial versions, some of which have been customized for the needs of education, credit union, government, small business, and other types of customers. Operating System: Windows, Linux.
If you have employees, you probably need to be able to create org charts and network diagrams on occasion. While it doesn't have as many pre-built templates and features as Visio, Dia makes it easy to create basic charts without spending a lot of money on software. Operating System: Windows, Linux.
You don't have to spend hundreds of dollars on Photoshop in order to create professional-looking images. Gimp offers a full range of retouching, image enhancement, special effects, filters and other image manipulation tools to meet almost any need. The link above works for Linux; if you run Windows, you'll need Gimp-win. Operating System: Windows, Linux
Like Illustrator or CorelDraw, Inkscape lets you draw your own graphics using a variety of virtual paintbrushes and other drawing tools. It's a high-quality program suitable for graphic designers, while still usable for those with less experience. Operating System: Windows, Linux, OS X.
Originally intended as a replacement for Microsoft Paint, this app has evolved far beyond the simple capabilities of Paint. It's not quite as advanced as Photoshop or the Gimp, but some people find it easier to use. Operating System: Windows.
This human resource management tool offers modules for personnel information, employee self service, leave, time/attendance benefits and recruitment. In addition to the core free version, Orange offers paid support, training, add-ons, customization, and an SaaS version. Operating System: Windows, Linux, Unix, OS X.
This open source office productivity suite includes word processor (Write), spreadsheet (Calc), presentation (Impress), graphics (Draw) and database (Base) applications. It reads and writes Office file formats, and it even creates pdfs. Operating System: Windows, Linux, OS X.
AbiWord is a full-featured word processor capable of creating documents with tables, charts, bulleted lists, endnotes, footnotes, mail merge fields, and more. The interface is similar to Microsoft Word and it can even save files in Word formats. Also, it also now offers online collaboration features through the AbiCollab.net service. Operating System: Windows, Linux, OS X.
Like MindManager, Freemind lets you create visual diagrams that show the relationship between words and ideasjust like you would on a white board or yellow pad during a brainstorming session. However, FreeMind's one-click "fold / unfold" and "follow link" operations make it a little faster than the commercial product. Operating System: OS Independent.
Gnumeric isn't meant to be an Excel clone, but it can read Excel files. It also offers some features Excel doesn't, like 154 exclusive functions, basic support for financial derivatives, basic support for telecommunication engineering, and more. Operating System: Windows, Linux.
In addition to a word processor (KWord), spreadsheet (KSpread), presentation (KPresenter) and database (Kexi), this office productivity suite also includes vector drawing (Karbon), project planning (KPlato), diagramming (Kivio) and painting (Krita) tools. While the interfaces are easy to use, they are quite different than Microsoft's, so it might take a while to get comfortable with the tools. Operating System: Windows, Linux.