Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Monitoro - Monitor webpages and get fresh data sent to your webhooks.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Accordably - Competitor monitoring made easy.
LoveSales - Find and save products you love, get alerted when they go on sale.
GitHub Diff - Compare changes across GitHub branches, commits, or tags