(Beeminder was also mentioned in a subthread reply by darrenf[2])
[0]: https://www.beeminder.com
[1]: https://www.beeminder.com/codesections/gallery
[2]: That reply read:
> Beeminder[0] is another. I particularly like that they keep a list of competitors in this space[1] - active, up and coming, dormant or dead. OP, perhaps you could think about asking Beeminder to add you to their list :)
> [0] https://www.beeminder.com/overview
> [1] https://blog.beeminder.com/competitors/