A major point in gundam series vs gundam movies is that many of the series had a movie following it as an expansion of sorts to answer unanswered questions. These are the shows we know so far had movies made for such:

Mobile suit gundam original
Movies: Gundam 1, Gundam 2, Gundam 3, and Chars Counterattack

Mobile suit zeta gundam
Movies: Zeta gundam 1, zeta gundam 2, zeta gundam 3

Mobile suit gundam 0083 Stardust memory
Movie: mobile suit gundam 0083 The Afterglow of Zeon

Mobile Suit Gundam Wing
Movie: Gundam Wing Endless Waltz

Mobile Suit gundam The 08th MS Team
Movie: The 08th MS Team: Miller's Report(based during series)

∀ Gundam
Movies: ∀ Gundam 1, ∀ Gundam 2

Mobile Suit Gundam SEED
Movies: After Phase: Between the Stars, SEED ASTRAY(bl & red)

Mobile Suit Gundam SEED DESTINY
Movies: Special editions parts 1-4

SD Gundam
Versions: SD Gundam Mk I, SD Gundam Mk II, SD Gundam's Counterattack, SD Gundam Mk III, SD Gundam Mk IV, SD Gundam Mk V, SD Gundam Scramble, Musha, Knight, Commando, SD Gundam Festival