Google is testing a number of additional carousels in Google Search. These carousels are titled "research," "people also shop" and "similar products." Here are screenshots and screencasts of these in action from those who spotted them.
I should note, this is my fast way of catching up from my week on vacation, so sorry for lumping them all together:
(1) Research carousel in Google Search:
Query Number 2: cotton candy machines pic.twitter.com/dHKJkTlkdk
— Saad AK (@SaadAlikhan1994) August 18, 2021
(2) People also shop carousel in Google Search:
Here are more queries which triggered it:
— Saad AK (@SaadAlikhan1994) August 20, 2021
Query Number 2: Toms
Sending to: @rustybrick SIR
CC: @brodieseo & @glenngabe SIR. pic.twitter.com/1fBVNSa8T8
(3) Similar Products carousel in Google Search:
Google testing a "similar products" carousel #google #mobile #serp pic.twitter.com/NwyvTv3OMN
— Valentin Pletzer (@VorticonCmdr) August 22, 2021
I believe there are more, but here are some of the ones I didn't cover last week.