Web tools
Web pages used infrequently but worth knowing about — bookmark-style tips, no install required.
Tip 60.1: Debuggex — visual regex debugger
Renders a regex as a railroad diagram and steps through matches against a test string. Helpful when a pattern works but you can't see why.
Tip 60.2: Monkeytype — typing practice
Clean, minimal typing trainer with WPM/accuracy stats and configurable test length, language, and word lists.
Tip 60.3: Kafka Streams Topology Visualiser
Paste the Topology#describe() output from a Kafka Streams app and get a graph of sources, processors, state stores, and sinks. Indispensable when reasoning about a non-trivial topology.