Tor Browser:
Tor Browser contains everything you need to safely browse the Internet.
Orbot:
Tor for Google Android devices.
Tails:
Live CD/USB operating system preconfigured to use Tor safely.
Nyx:
Terminal (command line) application for monitoring and configuring Tor.
Relay Search:
Site providing an overview of the Tor network.
Pluggable Transports:
Pluggable transports help you circumvent censorship.
Stem:
Library for writing scripts and applications that interact with Tor.
OONI:
Global observatory monitoring for network censorship.