The Blender Community
Being freely available from the start, even while it was closed source, considerably helped Blender's adoption by the community. A large, stable, and active community of users has gathered around Blender since 1998. The community showed its support for Blender in 2002 when they helped raise €100,000 in seven weeks to enable Blender to go Open Source under the GNU GPL License.
Independent Sites
There are several independent websites such as forums, blogs, news, and tutorial sites dedicated to Blender.
One of the largest community forums is Blender Artists, where Blender users gather to show off their creations, get feedback, ask and offer help and, in general, discuss Blender.
Getting Support
Blender's community is one of its greatest features, so apart from this user manual, there are many different ways to get support from other users, such as Blender Chat, Stack Exchange, and Reddit.
For studios and organizations there is Enterprise support, and for studios looking to add Blender to their pipeline, Blender Studio contains documentation and training material around this topic. If you think you have found an issue with Blender, please report a bug.
More details about support can be found on the support page.
Development
Being open source, Blender welcomes development from volunteers. Communication between developers is done mostly through three platforms:
The projects.blender.org system
Online Chat (see below)
If you are interested in helping develop Blender, see the Get Involved page.
Blender Chat
For real-time discussion, we have blender.chat which uses Blender ID for authentication.
You can join these channels:
#today For getting answers from the community.
#blender-coders For developers to discuss Blender development.
#python For support for developers using the Python API.
#docs For discussion related to Blender's documentation.
Other Useful Links
Blender FAQ (Can I use Blender commercially? What is GPL/GNU? ...)
Developer's Ask Us Anything!