Hazel
Used by 7 peoplenoodlesoft.com ↗

“Hazel shuttles endless PDFs around, renaming and filing them in the proper places.”
Rob Giampietro Interview, Designer (Project Projects), writer · via Uses This 
“Hazel for folder/file monitoring and automation.”
Ethan Schoonover Interview, Designer, developer (Kinkless, Solarized) · via Uses This 