LetterHunt - LetterHunt connects you to 10,000+ niche, active newsletter writers to promote your product.
Wikiquote - A free quote database built collaboratively using Wiki software, a sister project to Wikipedia.
Mattermark Daily - A curated newsletter of blog posts from investors & founders
Quotefancy - Quotefancy is on a mission of turning inspiring quotes into beautiful wallpapers.
Taco Digest - Customizable personal email newsletter created from your favorite sources.
Brainyquote - Database of quotations by topic or author.