Hello, and welcome to the InspIRCd Wiki and Documentation project!
Here are some resources that may (or may not!) be useful:
Are you interested in Contributing? We'd love to hear from you!
The FAQ is a good place to start looking if you're new or curious!
To implement server software that talks to InspIRCd, the Spanning Tree Protocol documentation might be useful.
If you'd like to talk to us, we're on IRC (of course) on irc.chatspike.net #inspircd, but please make sure you read the channel rules first!