- software traceability
- software transactional memory
- software trap
- software trustworthiness
- software trustworthiness, software dependability
- software understandability
- software usability
- software usage quality
- software validation
- software verification
- software verifier
- software visualization
- Software Vulnerability
- Software Watermarking
- soft water
- softwood
- soft work
- soft X-ray
- soft X-ray background
- soft X-ray emission
- soft X-ray emission spectrum
- soft X-ray laser
- soft X-ray object
- soft X-ray repeater
- soft X-ray source