...SourceSquare is a free (as in free beer) and free (as in free speech, licensed under GNU Affero Public Licence V3) product, which scans a folder on your hard drive and displays a treemap that shows which part of your source code is open source.
Diagrammer for .Net Assemblies, also support for Javascript. Good for assembly dependencies. Good for showing the call graph in complex methods. Good for showing the jumps in IL. Good for getting an overview of where the complex parts of a system are.
Real-time error alerts, performance insights, and anomaly detection across your full stack. Free 30-day trial.
Move from alert to fix before users notice. AppSignal monitors errors, performance bottlenecks, host health, and uptime—all from one dashboard. Instant notifications on deployments, anomaly triggers for memory spikes or error surges, and seamless log management. Works out of the box with Rails, Django, Express, Phoenix, Next.js, and dozens more. Starts at $23/month with no hidden fees.
This anonymous emailer script written in PHP is a free, opensource project designed to send EMails from anyone to anyone, with additional details such as Reply-To ,an anti-spam CAPTCHA and a WYSIWYG.