Eclipse Theia trace viewer extension using the Trace Server Protocol (TSP), through the tsp-typescript-client. Also the home for reusable JavaScript libraries: traceviewer-base, traceviewer-react-components
Impulse - Very similar tool goals to Trace Compass (super specialized, low-level), "debug complex semiconductor and multi-core software systems." - Website, Tool code, Live demo
Get inspiration from other trace or related viewers and UI: