Popular

Solomon Islands	Sri Lanka	Slovakia
Suriname	Saudi Arabia	Saint Pierre and Miquelon
Saint Kitts and Nevis	Seychelles	South Africa
Senegal	Saint Helena	Slovenia
Sierra Leone	San Marino	Singapore
Somalia	Spain	Saint Lucia
Sudan	Svalbard	Sweden
South Georgia and the South Sandwich Islands	Syria	Switzerland
Sao Tome and Principe	Saint Vincent and the Grenadines	Samoa
Swaziland

These flags may not be used in a collection of any kind.
All other commercial and non-commerical uses are permitted.
(subject to appropriate laws).