To break out of the Atlassian #productivity bubble, we're currently testing Github projects and wikis as Jira and Confluence replacements at Geek Cell.
So far we're quite happy with up. Less context switching = less distractions. Also, having a company wiki/handbook under version control with PR support (hopefully) means less outdated pages.
Let's see how this setup holds up once the first non-nerd joins the company 😄