Keycard

Fallout 2

 * Red reactor keycard - unused keycard for Gecko's nuclear power plant
 * Yellow reactor keycard - unused keycard found on an Enclave guard, for Gecko's nuclear power plant
 * Vault 15 keycard - Keycard held by Zeke, near Vault 15

Fallout 3

 * Fort Constantine CO keycard - cut keycard to be used in Fort Constantine
 * Encryption key - key to open the drainage chamber's hatch of Broadcast tower KT8
 * Mama Dolce's encryption key - card for accessing terminal on the upper level of Mama Dolce's
 * Sector A encryption key - card for accessing terminal on the upper level of the Robot repair center
 * High clearance keycard - card to open door inside the Mobile base crawler in Broken Steel

Fallout: New Vegas

 * Elder's keycard - one of the 3 keycards required to start the self-destruct sequence in the Hidden Valley bunker, found on Elder McNamara or Edgar Hardin
 * Head Scribe's keycard - one of the 3 keycards required to start the self-destruct sequence in the Hidden Valley bunker, found on Head Scribe Taggart
 * Head paladin's keycard - one of the 3 keycards required to start the self-destruct sequence in the Hidden Valley bunker, found on Hardin of Ramos
 * Jenny Millet's security keycard - Utility room on the first floor of the REPCONN headquarters, for bypassing security robots
 * REPCONN second floor security card - on the second floor of the REPCONN HQ, to open a door on the second floor
 * REPCONN third floor security card - on the second floor of the REPCONN HQ, for bypassing security robots on the third floor
 * Lucky 38 VIP keycard - on Hanlon's desk in Camp Golf or Anthony House's desk in H&H Tools Factory, used on terminal in the Lucky 38 penthouse
 * Blue sector key card - on Philip Lem, opens doors in the blue sector in Vault 19
 * Red sector key card - on Samuel Cooke, opens doors in the red sector in Vault 19
 * Vault 22 cave door keycard - in Vault 22 Common Areas, grants access to the server room for acquiring the HEPA 20 cartridge filters.

Fallout 76

 * Nuclear keycard

Fallout: Brotherhood of Steel

 * Console keycard - held by a deathclaw, for gaining access to Level 3 of the Secret Vault - Laboratories
 * Emergency systems keycard - held by Patty, for opening the mutated section of the Laboratories
 * Facilities keycard - given to the Initiate by Patty, for the Secret Vault - Facilities
 * Laboratory keycard - given by Rhombus in Los, and taken from a deathclaw in the Secret Vault - Ruins cave
 * Residential keycard - card found in the Secret Vault - Residence Area 2, for opening an inbetween section of Area 1
 * Ruins keycard - keycard given by Patty, for accesing the Secret Vault - Ruins