~ NETPLAY ~
smashladder.com/help/netplay-guides
Guides that can help you set up Netplay for 64, Melee and Project M, allowing you to play those games with other people online.

~ 64 ~
meleeitonme.com/i-want-to-get-into-smash-64-where-do-i-start
A brief introduction to playing 64.

> 19XXTE
A hack of 64 which implements a variety of competitive features without the use of codes.
Get it here: tiny.cc/19XXTE

~ MELEE ~
docs.google.com/document/d/1_6o5NHvI9P8-qHp2M8w1gDzL_-JNonEE81Mh4ulY1PY
A document meant to help beginners out with Melee, and by extension, Project M.

> SD Remix
A mod of Melee meant to rebalance the game.
Get it here: sdremix.com

> 20XX
20XX Melee Training Hack Pack is a hack of Super Smash Bros. Melee made by achilles1515, that is designed to help players train for tournaments.
Get it here: http://smashboards.com/threads/the-20xx-melee-training-hack-pack-v4-05-update-3-17-16.351221/

> 20XX TE
A hack designed to run off of memory cards, made for tournament use.
http://www.20xx.me/

~ BRAWL ~
These are mods that take the base game of Brawl and change it up to be a much different and generally better experience. You will likely need a 2 GB SD Card for these to work. More detail about that is given on each site's download pages.

> Project M
The most popular of all Brawl mods, it aimed to recreate a fast experience like Melee was until the team disbanded.
Get it here: http://projectmirror.no-ip.org/
Get the leaked developer build with Knuckles/Lyn/Isaac here: https://mega.nz/#!lIE3QZqJ!kn-MGXnOxnoL7rt0ZigEjeXeJMuoW88zu8e77u96mFo

> Brawl Minus
A Brawl mod that aims to make every character broken.
Get it here: brawlminus.net

~ FOR 3DS/WII U ~
Comparison:
ssbwiki.com/Cross-platform_comparison_of_Super_Smash_Bros._4
This link outlines the differences and similarities between the two versions.

Media:
mega.co.nz/#!c5olzLxT!nHY8AelJjceDyQHbpoSQcXcefVlEDRPt2FGWBbKrAaU
A rip of the Wii U OST. Contains every song except 3DS exclusives.

smashbros-miiverse.com/music
You can also listen to specific, individual tracks, sorted by series.

smashbros.com/us/movielist
Various videos, including Character Reveal trailers, Commercials, and Directs.

Tools:
>Roster Maker
apps.warchamp7.com/smash/rosterHD
A webpage that can be used to show off your mains.

>Tier List Maker
https://quetzle.github.io/smash-apps/tier/
A webpage that can be used to rank characters.

~ CHAZO ~
https://u.pomf.is/pceuwd.png
http://pastebin.com/2Edttp8U

~ FANGAMES ~
> Super Smash Flash 2
The sequel to Super Smash Flash, it has a more reasonable roster as well as netplay.
Get it here: mcleodgaming.com/viewflash.php?id=6&type=game

>Super Smash Land
A simple, Game Boy-styled demake, with humble controls and a humble roster.
Get it here: supersmashland.com

> Super Smash Bros. Crusade
A fangame that has a gigantic roster.
Get it here: indiedb.com/games/super-smash-bros-crusade