UXtweak is a user testing and usability research platform with a range of features.
Unmoderated studies are remote tests that generate screen-capture video of users completing a set of tasks on a website. Session replay videos of these tests are fully inspectable, including the DOM for identifying relevant items of code.
Tree Tests set users tasks in order to measure the effectiveness of website structure and labelling.
Card Sorts help to understand how users group and label content for organising product groups, categories or other navigation structures.