Helpful user contributed resources
FAQ
Installation Procedure
Ubuntu specific guides (currently more updated than official guides)
Common problems migrating from old versions to new versions
API installation/validation guide- (use the link above first, if you face problems, refer to this link)
Using a dedicated Hard Drive - Adding HDDs for more storage.
Single Board Computers - Notes for ARM devices.
GPU passthrough in VMWare - Notes on using GPUs with Zoneminder running in a virtual machine
Email - Getting notifications when alerts occur.
Supported
MobileDevices - View ZM from your phone.
Third party
Embed any IP Camera in website and webpages securely - Free, many options. Includes many live examples.
Zonerama - Merges multiple monitors into one and supports video creation.
IpCamMontage Ip Camera Montage - remove the user viewing load from the server for IP Camera setups.
Infrared Leds, Cameras, DC-DC converters etc
External resources of information related to ZM
Community documentation
Various Learnings from getting Zomeminder 1.28.1 working well on Ubuntu Server 14.04
CCTV Laws
California Report on Public Video Surveillance