ManageEngine ADAudit - ManageEngine ADAudit is a real-time windows active directory auditing tool.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Spectrum - Browser-based app to visualize the frequencies of an audio file.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.