Hosted Comments https://www.hostedcomments.com/ , a Disqus alternative with a focus on privacy. The learning experience of building Hosted Comments was great : using iframes to embed comments in websites, building a commenting system with voting and some features which Disqus does not have : locking comments, hiding comments (not yet deployed https://imgur.com/a/R89Cw ). It started out as a sideproject, then decided to go the SaaS route and now a little confused about whether I want to pursue this as my main project. I'm thinking about releasing an open source self hosted version and continue offering a managed service.
Bored Hackers https://www.boredhackers.com : a public chatroom based community site. Think of it like reddit, but chatrooms insteads of forums. I just deployed the first version a few hours ago. Bored Hackers is an experiment at building the community site that I wish existed : public chatroom based communites, pseudonymous users, transparent moderation logs, an open source code base and a site that is welcoming to non-technical users. Currently, there is a single chat room for all discussions and support for user created chat rooms will be added shortly.