I really like Discord. It works across multiple platforms, if you don't want to install an application on your computer you can run it in a web browser, it's free, it's effective and the company is growing.
I proposed it as a way to supplant IRC in favor of a more modern platform that includes both text chat and voice chat for those who want to do that but BlackBox and Arklon brought up a good point -- they wanted to integrate IRC functionality into the website/game client and Discord is proprietary. Fair enough argument so I kind of left it alone.
I'm still in favor of taking advantage of Discord.