16) TikiWiki Replaces: Confluence, SamePage Although it's a wiki at heart, this app also includes other content management features like forums, blogs, image galleries, RSS feeds, etc. It supports multiple languages and has been downloaded more than 800,000 times. Operating System: OS Independent
17) WebGUI Replaces: Sitecore CMS, Kentico Calling itself an "all-in-one CMS," WebGUI combines content management with a Web application framework so that users can create their own Web apps. The site offers extensive help for new users, including a weekly training webinar. Operating System: Windows, Linux/Unix, OS X
19) Covide Replaces: SalesForce.com Covide promises up to 30 percent improvements in user productivity. In addition to CRM functions, it also includes some CMS, groupware, VoIP, calendar and e-mail functionality. Like Salesforce.com, it's available in a SaaS version. Operating System: Windows, OS X, Unix.
20) vtiger CRM Replaces: SalesForce.com This app offers "true open source CRM in the cloud" for $12 per user per month. Of course, you can also download the code and host it yourself for free. Operating System: Windows, Linux
21) Orange Leap Replaces: Blackbaud, Convio Orange Leap offers a different type of CRM"Constituent Relationship Management." This app aims to help non-profits simplify their communications with donors and other stakeholders. Operating System: Windows
22) CiviCRM Replaces: Blackbaud, Convio Like Orange Leap, CiviCRM is designed for non-profit organizations. It includes modules for case management, donor management, event registration and tracking, membership, e-mail and reporting. Operating System: OS Independent
25) cyn.in Sharepoint, Novell Groupwise Cyn.in comes with collaborative applications, like blogging, wikis, file sharing, calendars, discussion boards,etc. It also provides collaborative "spaces" for different sub-groups to work together and integrates a variety of social networking features as well. Operating System: Windows, Linux, OS X
26) Group-Office Replaces: Microsoft Office Outlook, Basecamp, This Web-based app includes a calendar, file sharing, e-mail, basic CRM capabilities and billing. You can host the open source version on your own server or use the subscription-based cloud version. Operating System: OS Independent
27) phpGroupWare Replaces: Microsoft Office Outlook, Sharepoint A true multi-functional suite, phpGroupWare includes more than 50 tools, including contact management, e-mail, calendar, content and document management, project management, and an application programming interface. Part of the GNU project, this tool is used by tens of thousands of users internationally. Operating System: Windows, Linux
28) Simple Groupware Replaces: Microsoft Office Outlook, Novell Groupwise This Web-based enterprise groupware includes email, calendaring, contacts, tasks, document management, project management and more. It synchronizes with Outlook and smartphones, and it's easy to customize for an individual organization's needs. Operating System: Windows, Linux
29) Evolution Replaces: Microsoft Office Outlook "The Outlook of Linux," Evolution provides an e-mail client, address book, to-do list and calendar for the Gnome desktop. Key features include spam filtering, encryption, advanced searching and user-defined filters. Operating System: Linux
30) Thunderbird with Lightning Replaces: Microsoft Office Outlook Thunderbird is an e-mail client with an interface that looks a lot like Firefox. Lightning lets you integrate calendar functions with your e-mail. Both come from Mozilla, the organization behind Firefox. Operating System: Windows, Linux, OS X
31) Zimbra Replaces: Microsoft Exchange Designed for large enterprises, the Zimbra messaging and collaboration suite offers group email, contact list, calendar, and document management capabilities. The fee-based versions add enterprise administration capabilities and mobile/desktop sync. Operating System: Linux, Unix, OS X
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