- Roland Geider – https://github.com/rolandgeider
- Helen Sherwood-Taylor - https://github.com/helenst
- Tushar Gupta - https://github.com/Tushar-Gupta
- Matheus Zorzete Marchiore - https://github.com/marchiore
- Yu Yu Aung - https://github.com/max111
- Laszlo Ratsko - https://github.com/rlaszlo
- James Simas - https://github.com/jamessimas
- Benny Tran - https://github.com/tranbenny
- Roman Pavlov - https://github.com/romansp
- Mihail Burduja - https://github.com/warchildmd
- Colin Hare - https://github.com/cthare
- Ryan Hughes - https://github.com/purplebird
- Alexandre Murphy-Gonthier - https://github.com/murphyalexandre
- Verdi R-D: https://github.com/azend
- Alois: https://github.com/alokhan
- Alelevinas: https://github.com/alelevinas
- Jacob Stoebel: https://github.com/jstoebel
- Peter van der Does: https://github.com/petervanderdoes
- Malcolm Jones: https://github.com/DevloperMal
- Bulgarian: Lyuboslav Petrov
- Czech: Tomáš Z.
- Dutch: David Machiels
- Greek: Mark Nicolaou
- Norwegian: Kjetil Elde
- Portuguese: Jefferson Campos – http://jeffersoncampos.eti.br
- Russian: Inna
- Spanish: acv2facundo
- Swedish: ywecur
And of course many thanks as well to everyone that submited exercises!