Very similar to Basecamp, Collabtive is cloud-based groupware for tracking projects, milestones, tasks and time spent. It also imports Basecamp data. You can host it on your own server or use the paid hosting service. Operating System: OS Independent.
37. Feng Office
More than 350,000 people use Feng Office, including those at NASA, the NBA and the U.S. Department of State. It offers project management, client relationship management, billing and finance modules that are designed with professional services organizations in mind. The company primarily promotes its cloud-based service, but you can also find an on-premise version, other services and the open source version at the site. Operating System: Windows, Linux, OS X.
Group-Office includes shared calendar, CRM, e-mail, file sharing, and project management capabilities, all with mobile support. It comes in a community version, professional (on-site) version and a hosted version. Operating System: OS Independent.
Aimed at hosting providers and ISPs as well as enterprises and small businesses, Scalix offers an alternative to Microsoft Exchange servers for group e-mail and calendaring. It comes in numerous flavors, including the community, enterprise, small business and hosting editions. Operating System: Linux.
Another alternative to Microsoft Exchange, Zimbra offers "integrated email, contacts, calendaring, sharing and document management plus mobility and desktop synchronization." In addition to the open source edition, the company also offers a desktop client, a network edition and an appliance edition designed for use with VMware cloud infrastructure. Operating System: Linux, Unix, OS X.
Calling itself the "most modern, adaptable and affordable ERP solution," Compiere offers reporting, dashboards, warehouse management, manufacturing, purchasing, order management, financial management, sales, website, CRM and much more. It comes in open source or enterprise editions, and it's also easy to run the enterprise version in Amazon's EC2 cloud. Operating System: Windows, Linux, OS X.
42. Openbravo ERP
With more than 2 million downloads to its credit, Openbravo claims to be "the leading Web-based professional enterprise resource planning solution. The professional version of the software is available only through Openbravo's channel partners, but you can download the community edition or a free trial of the professional edition from the website. Operating System: Windows, Linux, OS X.
43. Open ERP
OpenERP offers more than 700 modules, so it's easy to tailor to your specific needs. It comes in three flavors: the open source community version, a paid enterprise version, or a cloud-based online version. Operating System: Windows, Linux.
Used by Toyota, Honeywell and other well-known companies, Opentaps considers itself "the most advanced open source ERP + CRM solution." In addition to the free open source software, the company offers a supported professional version and several cloud-based versions available for deployment on Amazon EC2. Operating System: Windows, Linux.
Downloaded more than 150,000 times, project-open aims to bridge the gap between ERP and project management, combining many of the most important features of both types of solutions. It's particularly well-suited for the needs of advertising and marketing agencies, IT service management companies, translation businesses and consulting firms. The core modules are free, but the company also offers paid support, extension modules, consulting, automatic updates and an SaaS version. Operating System: OS Independent.
This company claims you can download, install and get up and running with its ERP/CRM solutions in just ten minutes. The PostBooks version of the software is the open source version; xTuple offers many other paid versions (both on-premise and cloud-based) that are tailored for the needs of different types companies. Operating System: Windows, Linux, OS X, mobile OSes.
You'll find the open source version of this firewall, Smoothwall Express, at Smoothwall.org. At the main corporate site, Smoothwall offers more complete security and Web filtering products that incorporate the open source firewall. Operating System: Linux, Unix.
48. Endian Firewall
The "leading provider of open source network security solutions," Endian offers a free, open source version of its software that you can use to turn any PC into your own unified threat management appliance. It also sells a variety of commercially supported hardware and software appliances based on the same technology. Operating System: Linux.
49. Untangle Like Endian, the community version of Untangle allows you to create your own UTM appliance. However, the Untangle download includes some commercial features that will deactivate after 14 days unless you purchase a commercial license. The company also sells pre-configured appliances that offer "plug-and-play" network security. Operating System: Linux.