BetterTTV is described as 'Enhances Twitch with new features, emotes, and more' and is an app. There are four alternatives to BetterTTV for a variety of platforms, including Twitch, Firefox, Google Chrome, Online / Web-based and Opera. The best alternative is Gumbo, which is both free and Open Source. Other great apps like BetterTTV are FrankerFaceZ, Moobot and Nightbot.
FrankerFaceZ is a Twitch extension that lets any broadcaster add custom emotes to their channel. Just install and enjoy the community of thousands of broadcasters who are excited to bring you a more social and fun experience.
Nightbot is a chat bot for Twitch, Youtube Gaming, and Mixer that can perform a variety of moderating tasks specifically designed to create a more efficient and friendly environment for your community.