XMLTV.se is the longest running project of mine and produces tv schedules in JSON and XMLTV formats for Europe. It has over 800 tv-channels and radiostations that is updated daily and hourly. Uses PERL.
Used by 70,000 unique users per month.
It's opensource and is available on Gitlab (gitlab.com/xmltv-se).
Honeybee.it is a tvguide site that imports the files from XMLTV.se and add additional data from various sources such as TheMovieDB and TheTVDB.
The API is used by several big websites, apps and companies in Europe. Uses Ruby on Rails, PostgreSQL, AngularJS
Used by ~40,000 users per month.
Lensire.com was a contact lens price comparison website that fetches prices from various resellers all over the world. Uses Elixir, ArangoDB and VueJS