The Catalan Opening starts 1. d4 Nf6 2. c4 e6 3. g3. The opening book names 14 variations of it, under ECO E00 to E09.
The main line, move by move
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Starting position5 more to go
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All 14 Catalan Opening variations
E00Hungarian Gambit1. d4 Nf6 2. c4 e6 3. g3 e5
E01Open Defense1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 (also reached by 4 other move orders)