The authors of the dependency Rust crates:

arrayvec (version 0.7.2):
  bluss

autocfg (version 1.1.0):
  Josh Stone

cfg-if (version 1.0.0):
  Alex Crichton

euclid (version 0.22.7):
  The Servo Project Developers

extendr-api (version 0.3.1):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Hiroaki Yutani
  Ilia A. Kosenkov

extendr-engine (version 0.3.1):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Hiroaki Yutani
  Ilia A. Kosenkov

extendr-macros (version 0.3.1):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Hiroaki Yutani
  Ilia A. Kosenkov

float_next_after (version 0.1.5):
  Bronson Brown-deVost

fontdb (version 0.9.1):
  Evgeniy Reizner

lazy_static (version 1.4.0):
  Marvin Löbel

libc (version 0.2.126):
  The Rust Project Developers

libR-sys (version 0.3.0):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Ilia Kosenkov
  Hiroaki Yutani

log (version 0.4.17):
  The Rust Project Developers

lyon (version 1.0.0):
  Nicolas Silva

lyon_algorithms (version 1.0.0):
  Nicolas Silva

lyon_geom (version 1.0.1):
  Nicolas Silva

lyon_path (version 1.0.0):
  Nicolas Silva

lyon_tessellation (version 1.0.1):
  Nicolas Silva

memmap2 (version 0.5.5):
  Dan Burkert
  Yevhenii Reizner

num-traits (version 0.2.15):
  The Rust Project Developers

once_cell (version 1.13.0):
  Aleksey Kladov

paste (version 1.0.7):
  David Tolnay

proc-macro2 (version 1.0.40):
  David Tolnay
  Alex Crichton

quote (version 1.0.20):
  David Tolnay

syn (version 1.0.98):
  David Tolnay

ttf-parser (version 0.15.2):
  Yevhenii Reizner

unicode-ident (version 1.0.2):
  David Tolnay