The World of Darkness (1991 - 2004;
then 20th Anniversary 2015+)

The material here will start off as being for 2nd Edition but I will be updating them to 20th Anniversary Edition.  This will include some extrapolation for Hunter, Mummy and Demon since they do not have a 20th Anniversary treatment.
 

General World of Darkness

House rules include information for Attributes and Abilities 6 and up, Child characters, alternate rules for use in Combat, rules on who is or is not Awakened.

House Rules for Bastet Yava and Form Bonuses and Gurahl Rage expenditure. New Changing Breed ... the Ahuizotl: Rules for were-weasels, skunks, wolverines, otters and badgers.

Encouraging Vulgar Magick (for games with a lighter feel), Paradox Dice (inspired by Nightmare Dice from Changeling), Permanent Paradox and Alternate Damage Rules.

There are five Kiths, three Arts, a Realm, five Merits & Flaws, Indexes for Kiths, Houses and Cantrips including book and pages numbers to find them easily, rules for Ritual Cantrip Casting, Treasures, and more House Rules.

House Rules for Healing, Amenti Purposes and Liabilities, a variant of Academics for Ancient Egyptians, and a revised Vessel background.