Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
schnaq - Create an engaged and interactive audience with the schnaq Q&A, polls and more.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Pingo - Optimize images for the web quickly 🖼️⚡
Askalot - Askalot is a next generation CQA (Community Question and Answer) system.
Presentii - Imagine a tool that lets you capture audience interest in your presentation content as you present.