CaptionBot by Microsoft - Analyzing and describing images by a bot
Typorama - Typorama: Text on Photo Editor is a Typography Art and Poster Maker application created and published by Apperto Ltd.
WTF is that? - Send any picture and it will tell you what it is!
Polona Typo - Type, share and print your own sentences using thousands of letters from the books, posters and maps created over more than six centuries.
Instagram Caption Writer - Write nice formatted Instagram captions.
Font Candy - Font Candy lets you mask your photos with captions or simply overlay your images with text.