A friend and I have been running WeScreenplay (https://www.wescreenplay.com), a very niche service for screenwriters, for about 2.5 years now. I recently separated the backend platform that manages and coordinates everything and spun it off into Coverfly (https://www.coverfly.io), which we sell to film festivals to manage their screenplay contests.

Between the 2 products (which use the same codebase), we've tripled in size every year. $27k in 2014, $80k in 2015, and we're projecting to do $250k+ in revenue this year. Hoping to do $1m in 2017.

For marketing: affiliate programs, paid SEO, organic SEO, Facebook, Twitter, cold calling, sponsoring events with writers