EFF explained

EFF or eff may refer to:

Politics

Economic Freedom Fighters, a South African communist political party
Economic Freedom Fund, an American political organization
Election Fighting Fund, a British suffragist organization supporting the early Labour Party
Electronic Frontier Foundation, a US-based international digital rights group
Evergreen Freedom Foundation, an American political think tank

Eff (duo), a German musical duo
Eff (programming language), a functional programming language with focus on algebraic effects
Efficiency (basketball), a statistical benchmark
Effingham Junction railway station, Surrey, England, National Rail station code
The Electronic Font Foundry, a British computer type foundry
Emmett/Furla Films, now Emmett/Furla Oasis Films, an American production company
Environmental Film Festival in the Nation's Capital, in Washington, D.C., United States
Ethiopian Football Federation
Extrusion freeform fabrication, a method for fabricating functionally graded material
F, a letter of the alphabet
A minced oath of the obscenity Fuck