WebPagetest : Run a free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds. You...
Wappalyzer : Wappalyzer is a cross-platform utility that uncovers the technologies used on websites. It detects content management systems, ecommerce platforms, we...
mmm.page : Dead simple, drag & drop personal websites.
LGTM.in : Looks good to me (LGTM) is the most popular comment on Github, perhaps. But LGTM is boring. So we spice it up with some images.
OpenCensus : A single distribution of libraries that automatically collects traces and metrics from your app, displays them locally, and sends them to any analysis...
A free analysis tool to check if a website is disguising third-party trackers as first-party trackers.