Twitterrific
Used by 15 peopletwitterrific.com ↗

“Twitterrific is my constant companion despite everything Twitter is doing to hobble the third party clients after riding those clients to prominence.”
Geof Morris Interview, Aerospace and systems engineer · via Uses This 
“My Twitter client of choice is Twitterrific, on both the Mac and the iPod.”
John Siracusa Interview, Programmer, writer (Ars Technica) · via Uses This 
“So it's no surprise that Twitterrific is a heavy used app.”
Sophia Teutschler Interview, Mac developer (CoverSutra, Groceries, Tipulator) · via Uses This 
“I check Twitter with Twitterrific (probably too much).”
Garrett Murray Interview, Film maker, creator of Ego · via Uses This 
“If Twitter counts as work-related, and I suppose it does insofar as I often find stuff to link to from it, Twitterrific.”
John Gruber Interview, Writer (Daring Fireball) · via Uses This