Reeder 3, a news reader with support for multiple services like
– Feedbin
– Feedly
– Feed Wrangler
– Fever
– FeedHQ
– Inoreader
– NewsBlur
– Minimal Reader
– The Old Reader
– BazQux Reader
– Readability
– Instapaper.
Don't want to use a third-party service? Reeder also supports local/standalone RSS (no sync).

Themes:
– Light
– Classic (iPad only)
– Dark → night reading
– White → more contrast
– Black → more contract, night reading

Sharing services:
– Safari Reading List
– QUOTE.fm (recommend and read later)
– Buffer
– Readability
– Instapaper
– Pocket
– Evernote
– Pinboard
– Zootool
– Delicious
– App.net
– Twitter
– Facebook
– Messages
– Mail
…and more via sharing extensions.