KNIME is not only open source software but community. The extremely active KNIME community is spread around the world and covers a wide range of topics, industries and experience levels.
The strong KNIME Community forum is available for all types of questions, comments and conversations.
KNIME users also make their extensions available to the other users on KNIME Analytics Platform, and there are some very good contributions. Check out what is available (and how you can contribute) at KNIME Community Contributions.