University of Reddit might be a bit more popular than Suggest Subreddit. We know about 1 link to it since March 2021 and only 1 link to Suggest Subreddit. 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.
On a related note, let me shill my side-project: https://nikas.praninskas.com/suggest-subreddit/ It suggests subreddits based on what you're already subscribed to. - Source: Hacker News / almost 3 years ago
uReddit - Made by Redditors for other Redditors. Tons of different topics, varying from things like science and art to Starcraft strategy. Source: over 2 years ago
Reddit List - Tracking the top 5000 subreddits
Beam for reddit - Discover and browse reddit on your iPhone
YesPromo - Free database of 100+ successful self promotion Reddit posts
reddit shell - Web-based shell for browsing reddit (pretend you're working)
FindAReddit - Find subreddit for your niche
Reddit App - The official app for Android & iOS. Meow.