NLog is available as source code and binary packages.
Binary packages are available via NuGet
Binary packages are also available as zip via GitHub
Source code is available at GitHub
Older releases can be downloaded from CodePlex. Installer and zip packages are available.
Support & examples
Tutorials, examples and references can be found on the GitHub wiki
Support for NLog is available via NLog user group.
If you're interested in joining NLog development efforts, go to NLog development group.
Bug reports and feature requests could be submitted at the GitHub issue tracker.
Finally there is the NLog Contrib repository, to test and develop new features which could be included in the core at a later time.