All (?) upcoming alternatves to Disqus: (my own listed last)

- Mozilla's Talk, https://github.com/coralproject/talk. Open source, install yourself.

- Discourse, https://www.discourse.org/. One needs to navigate to a separate page, to post a comment. Not threaded. Min $20/month. Open source. Facebook and Gmail login.

- Isso: https://posativ.org/isso/. Open source, install on your own server.

- Commento, https://github.com/adtac/commento. Open source. Moderation, spam-protection and hosting is under development.

- Schnack, https://www.vis4.net/blog/2017/10/hello-schnack/. Open source, install yourself. Has GitHub and Facebook login.

- HostedComments, https://www.hostedcomments.com/. Proprietory. Min $10/month

- Remarbox, https://www.remarkbox.com/. Proprietory. Min $4/month

- Gitalk. https://github.com/gitalk/gitalk. Open source, install yourself. Comments stored as GitHub issues.

- https://github.com/skx/e-comments. Open source, install yourself.

- And my own: EffectiveDiscussions: https://www.effectivediscussions.org/blog-comments. Open source, or $2 per month. Has Facebook and Gmail login.