I already mentioned the Gitea instance on the social platforms page, but I'm never sure which it is. I decided that it is collaborative, and therefore social... Ultimately, though, I want people to be able to find it, so it's here too!
Point is - there's a Gitea instance, which lets you host your git repositories in a nice, safe and non-corporate place. For the features and such, do checkout the social platforms page - or just go ahead and make an account. (I'm aware the captcha isn't accessible - I'm working on that, but for now, if it's a problem, you can get your account setup for you).
The Lounge is a web-based IRC client. Login, join your server & channels. It'll keep you connected (and preserve your scrollback!), and you can login from any browser to chat. There's no direct registration, so you'll need to request an account.
Miniflux is an RSS aggregator and reader with a focus on simplicity. It's useable both on computers and mobile devices, and lets you subscribe to, organise and read RSS feeds from your favourite sites.
You can request an account to get started!