Episoder – TV Show Tracking Tool app provides features to allow you to view the complete schedule of airing time of all the episodes of your favorite TV show, so you can watch your favorite TV show without disturbing your schedule.
We don't know any good Episoder open-source alternatives yet.
You are more than welcome to suggest any alternatives that you know of, or ask the community for suggestions.
Alternatively, we recommend checking out LibHunt for open-source libraries and alternatives to Episoder.