Useful tools for working with NixOS

This article was originally published at https://gist.github.com/joepie91/67316a114a860d4ac6a9480a6e1d9c5c . Some links have been removed, as they no longer exist, or are no longer updated. 
 Online things 
 
 Package search 
 Options search 
 A list of channels, and when they were last updated 
 
 Development tooling 
 
 A .drv file parser in JS 
 rnix , a Nix (language) parser in Rust 
 
 (Reference) documentation 
 
 Nix manual 
 A complete list of Nix operators (the list in the official manual is incomplete) 
 nixpkgs manual 
 NixOS manual 
 Official NixOS wiki 
 
 Tutorials and examples 
 
 Step-by-step walkthrough of the Nix language 
 A shorter primer of the Nix language (probably a better option if you already know another programming language) 
 Nix pills (a series of articles about different aspects of Nix; ongoing work on a compact edition can be found here ) 
 Example configurations 
 Hardware configurations (includes configurations for dealing with quirks on specific hardware and models) 
 
 Community and support 
 
 The Nix forum 
 The Matrix space 
 
 Miscellaneous notes and troubleshooting 
 
 My Nix and NixOS notes: see the rest of the articles in this chapter! 
 My Hydra setup notes