Burr

Snowflake
Sonnenveld Cubed Burr
Sonneveld's 9 Piece Board Burr
Spherelation
Spies 2
Spiral
Spiral Burr
Spiral Lock
Spiral Lock (3D printed)
Splice
Staggered 12
Staircase Burr 2
Star Burr
Star Burr
Star Cluster Puzzle
Star of David
Stir the Coffee
stir the tea
Stowaway
Strap