TULib
Simplico
TULIO Recomienda
TULIO ZULOAGA
Tulip Interfaces Player
Tulip Interfaces, Inc.
uLIBRARY
Ulverscroft Group Limited
Henle Library – Urtext scores
G. Henle Verlag
ePlatform Digital Libraries
Wheelers ePlatform
Tumblr—Fandom, kunst, chaos
Tumblr, Inc
cloudLibrary
OCLC
Libby, by OverDrive
OverDrive, Inc.
Tulpenfestival - NOP
WISK Software