There are a lot of truly excellent things in the world. Here are some favorites I find worth sharing:

Things on the internet:

Wikipedia's taxonomy of vital articles
Examine What does a given molecule do in the human physiome?
Wendy Carlos's explorations on non-integer octave subdivisions

Essays, Nonfiction, Textbooks:

Finite and Infinite Games – James Carse The first chapter is all you need
Poetry and Ambition – Donald Hall
How to do what you love – Paul Graham
Feynman's Lectures on Physics
An Infinitely Large Napkin – Evan Chen
The NYT's famous 36 Questions

Poems:

Invictus – William Ernest Henley
A Dog Was Crying To-Night in Wicklow Also – Seamus Heaney
The Orange – Wendy Cope
Rain – Mary Oliver
Le Mauvais Vitrier (The Bad Glazier) – Charles Baudelaire

Art:

Pandora – Odilon Redon
Le Chevalier aux fleurs – Georges Rochegrosse
Mont Sainte-Victoire series – Paul Cézanne
Richard Renaldi's New Years Cards

Music:

Prokofiev – Piano Concerto No. 2
Ysaÿe –The six violin sonatas
Schnittke – Concerto Grosso
Barber – Piano Sonata (mvmts 3 and 4)
Haydn Wood – Mannin Veen
The First Circle (Pat Metheny) as arranged by Bob Curnow's LA Big Band

Products:

Obsidian
Anki
E Ink readers and RLCD displays

Fiction:

The Secret History – Donna Tartt
The Name of the Wind – Patrick Rothfuss