Ways to give disadvantage to saving throws?

[Dark Schneider]

Some status are applied to STR and/or DEX saves. But apart from status, that only affects these two, are there another ways to give disadvantage to saving throws of any ability? I know about Bestow Curse, but there aren't more ways?

[Skyblaze]

Sorcerer's metamagic, heightened spell

Arcane trickster's magical ambush

Eldritch Knight's eldritch strike

[Strangways]

Sorcerer's metamagic, heightened spell

Arcane trickster's magical ambush

Eldritch Knight's eldritch strike

Shadow sorcerer’s Hound of Ill Omen

[hymer]

Didn't we just have a thread (http://www.giantitp.com/forums/showthread.php?576816-What-can-cause-disadvantage-on-a-future-saving-throw) on this?