The more famous ones are: humblebundle, indiegala and HBI

Not all games in the charity package support steam activation.

Strictly speaking, it is a charity bag.

It is something launched by some game sales websites in cooperation with game publishers.

Usually a charity package includes multiple games, and most of the proceeds are used to support charitable causes.

Steam is an integrated platform, developed and created by Bram.Cohen, a BT software writer hired by Valve, the development company of Half-Life (HL). It was originally used as an instant update for Valve's games, but now it has developed into a convenient and fast comprehensive download platform. Players from all over the world can purchase games with Visa international credit cards in just 10 seconds and download them at BT-like speeds.