UI Jar might be a bit more popular than Upcase by thoughtbot. We know about 1 link to it since March 2021 and only 1 link to Upcase by thoughtbot. 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.
This site also has courses on web dev. Plus extra courses such as a course on refactoring that I really liked. Source: about 3 years ago
UI Jar: This is one of the better ones for “general” category. Check it out yourself. It has some extensive filters. Source: 11 months ago
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