Gadd Science, Incorporated

Gadd Science, Inc. is the company owned by Professor Elvin Gadd, mentioned by F.L.U.D.D in the beginning of the game, Super Mario Sunshine. This company presumably helped him produce his inventions such as:
 * Boo Repellent
 * Poltergust 3000
 * Super Poltergust 3001
 * Poltergust 4000
 * Game Boy Horror
 * Game Boy Horror SP
 * Ghost Portrificationizer
 * F.L.U.D.D.
 * Magic Paintbrush
 * Time Machine
 * Stuffwell
 * Starbeans Café
 * Ghost Gown
 * The Gaddlight
 * Hydrogush 4000
 * DS Time Radar
 * E. Gadd Battle Machine
 * Vacuum Orb
 * Magic Orb
 * E. Gadd's Garage
 * Gaddgets
 * Warpulator

Trivia

 * Gadd Science may be a pun of "Mad Science".