I vent my feelings and read other people's vent using this website. Source: about 2 years ago

Venting your feelings by writing them. Source: over 2 years ago

This website will self destruct It's a website that will erase itself if it doesn't receive a letter within twenty four hours. All of the messages you send are anonymous and you can also read other people's messages. It's a great place to vent and also read other people's messages. There are a lot depressing stuff there tho since its a place where people vent their feelings. Source: over 2 years ago

In addition to the website above, there's also https://thiswebsitewillselfdestruct.com , which I found through ludum dare. People can read and post letters anonymously and it's kinda like screaming into a digital void. Source: almost 3 years ago

You seem to have issues, maybe you can vent them on https://thiswebsitewillselfdestruct.com. Source: about 3 years ago

Https://mybarapp.com/ (have on my phone and am pretty happy). Source: almost 3 years ago