The best alternatives to MuchCast are Twitter, Stats for Twitter, and CrowdFire. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of MuchCast?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Keyword based search bar on Twitter is an excellent way to find relevant users. Our Twitter bio scraper is a simple no-frills tool that let's you get that info as a CSV file directly emailed to your inbox. Over 10 data fields including follower count.