TrainAway might be a bit more popular than Useberry. We know about 1 link to it since March 2021 and only 1 link to Useberry. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I've been looking at the variety of UT sites available for remote usability testing (useberry.com, maze.co, userzoom.com, UserTesting, userbrain.com, TryMyUI, userlytics.com, uxarmy, UXcam). Source: about 2 years ago
Trainaway.fit is probably the closest thing to what you mentioned, as they cover many countries. However, they only sell day passes. I used them a few years ago. Source: almost 2 years ago
Maze - Beautiful & actionable analytics for InVision prototypes
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Maze Templates - A library of pre-made user tests and surveys
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