Arthur Whitney's one liner sudoku solver (2011)

How to Write Computer Programs (2015) [pdf]

APL Quest

APL at Volvo

Dyalog APL Keyboard Layouts

Dyalog APL Graphs

Dyalog: Escrow

Mastering Dyalog APL (2009)

Dyalog APL 18.2

Mastering Dyalog APL (2009)

The APL Orchard

Dyalog - APL Problem Solving Competition

Dyalog APL 16.0

Dyalog APL v15.0 Free for Non-Commercial Use