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Checklist.design - Checklist collection of best design practices
Coblis - Color blindness simulator, tests color blindness for uploaded images
Colorblind Web Page Filter - Use to select safe colors earlier in the design process. Learn more about colorblindness in this Wikipedia entry
BetaBound - Free and testing is sorted by device and product type. Read more about how to best structure your product for BetaBound beta testing on the Developer FAQ
BetaPage - Free and paid options. You can submit products and startups for user feedback. If you sign up with LinkedIn you get more exposure
Beta Testers Hub - Free. More for startups who seek early adopters, and listings should offer some incentive (monetary or otherwise). Startups are listed as “trending” in the first 24 hours
Google Forms - Construct your questions to send to users in a quick Google form. Has “Responses” section that visualizes the response data for each question
HelloZest - Free. Quickly screen-record with audio online, has easily send-able link
r/BetaTesting Subreddit - General beta-testing
UsabilityHub’s 5-Second Tests - Free and fast test creation (requires account). Optimize clarity of designs by measuring people’s recall and first impressions. View an example here
BetaFamily - Testing for mobile apps. Free up to 1 listing. Other pricing tiers are $49/mos for 3 listings, and $399/mos for 10 listings
r/alphaandbetausers Subreddit - Mainly for app and web developers
r/AndroidAppTesters Subreddit - Mainly for android app developers
r/iOSBetaTesters Subreddit - Mainly for iOS app developers
r/TestMyApp Subreddit - Mainly for app developers
Userbrain - Get paid to be a product tester, or pay $30/mos (or $20 as a monthly subscriber) to find users to test
Usercrowd - Participate in quick design surveys, help make products better, and get paid doing it