Riter - Project management & team collaboration tool
GitHub Team Discussions - Now there's more space to talk through your projects 💬
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Schnack - Schnack is an open source commenting system written in JavaScript.
Confluence - Confluence is content collaboration software that changes how modern teams work
Product Hunt Reviews Widget - Embed and encourage PH reviews into your product