Stromae

As seen demonstrated in the YouTube video (@ 2:18), Stromae uses the Akai Pro LPK25 USB MIDI keyboard to lay down some melodic bass line notes with Propellerheads Reason NN-19 Sampler. The compact keyboard has become an apparent trademark to his production as he has been seen brandishing it in many interviews, videos of performances, as well as in some press photos like this one.

In this video, Stromae can be seen Korg MicroKey 37-Key USB Midi Controller starting at 1:00.

M-Audio Ozone can be seen 1:38 into this video.

at 0:50 in his video lesson numer 28

At 3:07,he used the Redrum for the kick and the clap on hit track:Alors On Danse

At 2:19 in this Stroma video, he says, "First of all I choose a special sound...and then...I use it in NN-19".

Stromae is probably wearing the Apple Eapods

At 1:22 Stromae talks about using Propeller head's Reason, and throughout the video you can see shots of his screen while he discusses a production of his, and takes you on a tour through Reason.

At 2:45 of this Stromae video by Propellerhead, Stromae is seen using the NN-XT Advanced Sampler to make a "special 90s synthesizer."

Throughout the video, you can clearly see that he uses an Apple MacBook Pro with Propellerhead Reason 7 running on it.