This list is by no means definitive or personal, just an import from the MUBI list here.

I'm not entirely comfortable with the nebulous definitions surrounding contemporary contemplative cinema, but it's an important topic for modern cinephilia and this is probably the most popular list for it.

Key discussion pieces:
<the original piece by Nick James for Sight & Sound is not available in any online format as far as I'm aware.>
Harry Tuttle
Steven Shaviro
Vadim Rizov
Danny Leigh
Dan Fox
Sukhdev Sandhu
David Bordwell
"A Research Blog"
"Screening boredom: the history and aesthetics of slow cinema" a PhD thesis by Orhan Emre Çağlayan
Everything else

A table discussion with Lav Diaz, Ben Rivers, Jonathan Romney, George Clark and Matthew Flanagan at the AV Festival

Michael Sicinski and I wrote a four-part series on slow cinema for To Be Cont'd.

Not listed in TMDb:
Crude Oil - dir. Wang Bing
s/t - dir. Lisandro Alonso
Life Track - dir. Jin Guang-hao
Prologue - dir. Béla Tarr
A Tree in Tanjung Malim - dir. Tan Chui Mui
Time Is Working Around Rotterdam - dir. Valérie Jouve
Sewer - dir. Sherad Anthony Sanchez
Ex It - dir. Cao Guimarães
The Fourth Dimension - Trinh T. Minh-ha
Podwórka - dir. Sharon Lockhart
Feldberg - dir. Michael Pilz
Ponce de León - dir. Ben Russell
Train of Thought - dir. Jim Jennings
Luv'in the Black Country - dir. Matthew E. Carter
Buried in Light - Jem Cohen
Skagafjordur - dir. Peter Hutton
Sitting - dir. Leighton Pierce
Nocturne - dir. Emily Richardson