- VCD (Value Change Dump) ASCII-based file format. Quite inefficient, but VCD is the only standard format for storing digital waveforms from HDL simulations.
- FST (Fast Signal Trace)
Developed by GtkWave authors to match FSDB (Fast Signal DataBase) from Synopsys’ VCS and WLF (Wave Log Format) from Mentor’s Questa simulators.
- fst-tools
- Written in Rust, wrapping around the FST C API from Gtkwave.
- “Research Paper”
- The original description and motivation for FST.
- FST Format Specification
- Unofficial formalization of FST format