The DLCs for Mass Effect 1 are now included in both the Steam and the Origin version of the game.
For Mass Effect 2:
Only the DLCs under "Cerberus Network Downloads:" are free to use. The DLCs under "DLC" musts still be bought beforehand. They will not get authorised in game if you don't own them.
No problem, I just pointed out that this ME2 DLCs:
Genesis
Arrival
Overlord
Lair of the Shadow Broker
Kasumi – Stolen Memory
Firepower Pack
Aegis Pack
Equalizer Pack
Alternate Appearance Pack 1 (Garrus, Thane, Jack)
Alternate Appearance Pack 2 (Tali, Grunt, Miranda)
are not free, they still must be bought before you can use them.
Since recently there are also DLC bundles for both ME2 and ME3 available in the Origin Store.
https://www.origin.com/irl/de-de/store/mass-effect/mass-effect-3/addon/mass-effect-3-dlc-bundle
https://www.origin.com/irl/de-de/store/mass-effect/mass-effect-2/addon/mass-effect-2-dlc-bundle
