Synergy Web Directory : Categories By Letter - S
| Sailing | Recreation Sports Sailing |
| Science | Blogs Science |
| Science | News Media Science |
| Science and Technology | Science and Technology |
| Script Services | Computers Internet Script Services |
| Search Engine Optimization | Computers Internet Search Engine Optimization |
| Security | Computers Internet Software Security |
| Security and Encryption | Computers Internet Security and Encryption |
| Services | Business Economy Services |
| Services | Web Directories Niche Directories Services |
| Shoes | Shopping Clothing Shoes |
| Shopping | Web Directories Niche Directories Shopping |
| Shopping | Shopping |
| Shopping | Blogs Shopping |
| Shopping Services | Shopping Shopping Services |
| Skating | Recreation Sports Skating |
| Skiing | Recreation Sports Sports Skiing |
| Snakes | Science and Technology Animals and Insects Pets Snakes |
| Snooker and Pool | Recreation Sports Sports Snooker and Pool |
| Snowboarding | Recreation Sports Sports Snowboarding |