Slack Channels
Mixed Methods
UX Research & Strategy
Research by Learners
UXPA (local)
Hexagon UX
ResearchOps
UX Mastery

LinkedIn Groups
Aspiring/Junior UX Researchers Initiative
Freelance UX Researchers
Practical UX Weekly
UX Research Association
UX Practitioners
UX Pros
UX Freelancers
UX Research Managers Forum
UX/HCI Researchers
Ladies that UX
User Experience Professionals Network
User Experience

Google Groups
[design-user-research]

Websites
Nielsen Norman Group

Volunteer Opportunities
UX Rescue
US Digital Response
Flik

YouTube Channels
Aona Talks

Books
Handbook of Usability Testing, 2nd ed., Rubin and Chisnell
Interviewing Users, Portigal
Measuring the User Experience, 2nd ed., Tullis and Albert
Mixed Methods: A Short Guide to Applied Mixed Methods, Sam Ladner
The Non-Designer’s Design Book, 4th ed., Williams
The UX Careers Handbook, Cory Lebson
Universal Methods of Design, Martin and Hanington

User Testing Opportunities
https://www.usertesting.com/get-paid-to-test – pays $10 for “think out loud” tests, $30-60 for live interviews
https://www.intellizoom.com/ – pays $5 for cardsorts, $8 for “think out loud” tests
https://www.utest.com/ref846529 (referral link) – pays a variety of amounts depending on project
https://www.usercrowd.com/ – short click tests that require 1-2 minutes, but usually pay $0.20 to $1.60
https://www.userlytics.com/tester/signup
https://app.testingtime.com/r/rec-af-zkTGiDZb (referral link)
https://app.userfeel.com/register/tester
https://tester.userbrain.net/
https://www.loop11.com/get-paid-to-test-websites/
https://ferpection.com/en/become-tester/
https://www.trymyui.com/worker/signup
https://test.io/become-a-tester/
https://www.hellopingpong.com/become-a-tester?r=LB8M (referral link)
https://www.userinterviews.com/hello?Email-5=
https://www.checkealos.com/get-paid-for-your-feedback/

You can also sign up for Google’s user research panel:
https://userresearch.google.com/
(previous list from Helen Lin on [design-user-research])
https://www.respondent.io/
https://www.surveyfeeds.come/about-us