CiviCRM provides a vital tool whereby nonprofits and other social projects can implement strong contact-relationship management capabilities without high monthly fees. It also provides the integration and customization capabilities necessary to make such software useful in the complex, lived reality of doing social engagement work. Plus it continues to build the open source toolset made available to the Commons and grow the common good.
Over the past 15 years I've been involved in several open source communities.
CiviCRM is without any doubt the one that has the strongest focus in welcoming "newbies" and letting everyone feel at home here. Another impressive feature is the focus on shipping. No matter what you think of CiviCRM today, you are almost sure that there will be a newer and better version in a few months.
The community provides excellent forum support, new ideas and feedback on suggestions. The CiviCRM software suits many use cases and allows us to support a large number of diverse UK voluntary sector organisations.
I continue to choose CiviCRM because it is open source and geared toward non-profit organizations. It meets both my CRM and advocacy functionality needs, without forcing forcing me to synch two different systems. And it does not force my non-profit users to think in sales terms (leads, opportunities, etc.). I find the CiviCRM community knowledgeable and responsive, and I like being part of a development community where its members want to share information.