Hear - Hear is a sound enhancement application for the Mac.
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
Krisp - Eliminate background noise, minimize distractions, feel more confident, and activate your communication superpower with Krisp, an AI-powered software solution for effective online meetings.
hCaptcha - Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
Quiet Time - A nifty app to reduce noise pollution in the office
scr.im - Don't share your email on public sites.