I am a software developer at Quansight, and am also the lead developer for the SymPy project.
Unless otherwise noted, all my answers on StackExchange, including code snippits, are released under Creative Commons CC0 (public domain).
Stack Overflow
Q&A for professional and enthusiast programmers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Ask Different
Q&A for power users of Apple hardware and software
Emacs
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English Language & Usage
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Super User
Q&A for computer enthusiasts and power users
TeX - LaTeX
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Ask Ubuntu
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Unix & Linux
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MathOverflow
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Area 51
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Physics
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Server Fault
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Puzzling
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Arqade
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Web Applications
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Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
English Language Learners
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Open Source
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Cross Validated
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Software Engineering
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Stack Overflow на русском
Вопросы и ответы для программистов
Software Recommendations
Q&A for people seeking specific software recommendations
Computer Science
Q&A for students, researchers and practitioners of computer science
Mathematica
Q&A for users of Wolfram Mathematica
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Salesforce
Q&A for Salesforce administrators, implementation experts, developers and anybody in-between
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Astronomy
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Magento
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Earth Science
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History of Science and Mathematics
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Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
スタック・オーバーフロー
熱狂的でプロフェッショナルなプログラマーのためのQ&A
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Buddhism
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Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Pets
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Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Biology
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Home Improvement
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Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Amateur Radio
Q&A for amateur radio enthusiasts
Literature
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Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Russian Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Russian language
Esperanto Language
Q&A for teachers and students of the Esperanto language
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Artificial Intelligence
Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment
Monero
Q&A for developers and users of the secure, private and untraceable cryptocurrency Monero
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Gardening & Landscaping
Q&A for gardeners and landscapers
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Project Management
Q&A for project managers
Drupal Answers
Q&A for Drupal developers and administrators
CiviCRM
Q&A for administrators and users of the CiviCRM Constituent Relationship Management software
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Poker
Q&A for serious players and enthusiasts of poker
Engineering
Q&A for professionals and students of engineering
Law
Q&A for legal professionals, students, and others with experience or interest in law
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Islam
Q&A for Muslims, experts in Islam, and those interested in learning more about Islam
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Psychology & Neuroscience
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Game Development
Q&A for professional and independent game developers
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Photography
Q&A for professional, enthusiast and amateur photographers
Academia
Q&A for academics and those enrolled in higher education
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Chess
Q&A for serious players and enthusiasts of chess
Homebrewing
Q&A for dedicated home brewers and serious enthusiasts
The Workplace
Q&A for members of the workforce navigating the professional setting
SharePoint
Q&A for SharePoint enthusiasts
Bricks
Q&A for LEGO® and building block enthusiasts
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Computational Science
Q&A for scientists using computers to solve scientific problems
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Information Security
Q&A for information security professionals
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history
Anime & Manga
Q&A for anime and manga fans
Sound Design
Q&A for sound engineers, producers, editors, and enthusiasts
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Stack Overflow em Português
Perguntas e respostas para programadores profissionais e entusiastas
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Quantitative Finance
Q&A for finance professionals and academics
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
WordPress Development
Q&A for WordPress developers and administrators
Ethereum
Q&A for users of Ethereum, the decentralized application platform and smart contract enabled blockchain
Travel
Q&A for road warriors and seasoned travelers
History
Q&A for historians and history buffs
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Seasoned Advice
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Movies & TV
Q&A for movie and TV enthusiasts
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Politics
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Graphic Design
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Personal Finance & Money
Q&A for people who want to be financially literate
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Space Exploration
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Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Open Data
Q&A for developers and researchers interested in open data
Hardware Recommendations
Q&A for people seeking specific hardware recommendations
Community Building
Q&A for community managers, administrators, and moderators
Ask Patents
Q&A for people interested in improving the patent system
Music Fans
Q&A for music historians, critics, and fans
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills