Question2Answer vs. Isso
Take a look at this side-by-side comparison of Question2Answer and Isso.
At a Glance
Question2Answer
About Question2Answer
Question2Answer (Q2A) is a popular open-source Q&A platform for PHP/MySQL.
Isso
About Isso
Isso is a lightweight commenting server written in Python and JavaScript, referred to as "Ich schrei sonst" in German.