Inoreader is a content reader for reading online articles and content.

Google Reader was an RSS/Atom feed aggregator operated by Google.

ReadKit is a full-featured read later and RSS client that supports services from Instapaper, Pocket, Pinboard, Feedly, Fever, NewsBlur, Feedbin, etc.

Feedspot is the content reader built especially for power users who want to save time.

Socialite is a reader app supporting multiple platforms including Twitter.