Kurogane Hammer
Kurogane Hammer is a website created and being developed by Aerodrome, a former global moderator on SmashBoards. It started up in October 2015 and has since been accredited by many members of the Smash community as a good resource of technical information.
Its purpose is to record and display frame data and hitbox behaviours for all the characters in Super Smash Bros. 4, as well as most character attributes (such as running speed and dodging frame data), in a way that can be easily understood. While the site was originally for Smash 4 explicitly, it has since expanded to have 3 more games: Super Smash Bros. Melee, Pokkén Tournament, and Rivals of Aether. Currently, Smash 4 is mostly complete, missing data only for a select few moves, most custom special moves, and character specific attributes; Melee is a work in progress, Rivals of Aether is basically complete, and Pokkén Tournament has only HP values and some stats for Sceptile.
There are also some humorous references and inside jokes throughout the site; in the character list itself, Lucas is titled "Ridley", Bayonetta's thumbnail is a picture of Masahiro Sakurai wearing Bayonetta's glasses, and Corrin's thumbnail is a picture of Arceus. Some moves and even characters are given nicknames in specific entries, and Aerodrome additionally released a cat version of the website on April Fools' Day, which consisted of thumbnails of cats for every character.
