Tortuga is based off of Python's turtle.py, created by:

Gregor Lingl

Here is an inevitably incomplete list of MUCH-APPRECIATED CONTRIBUTORS --
people who have submitted patches, reported bugs, added translations, helped
answer newbie questions, and generally made Tortuga that much better:

Al Sweigart https://github.com/asweigart/
Alejandro Pernin https://github.com/aleperno
Anand Krishnakumar https://github.com/anandkrishnakumar
Ari Lacenski
Brian Ward
Catherine Devlin https://github.com/catherinedevlin
Erman Korkut
Onur Ozay
Narrat https://github.com/Narrat
Toby Nance https://github.com/tobynance
Seunghyo Seo https://github.com/merong

Please contact the project maintainers if your name has unfortunately been omitted.