Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Notopass - Share your accounts without giving username/password
1Password - 1Password can create strong, unique passwords for you, remember them, and restore them, all directly in your web browser.
Password-Login.com - This site is additionally justified regardless of a brief specify yet appears to have a couple of inconveniences.
SuperTokens - Open Source User Authentication - An Alternative to Auth0 / Firebase Auth / AWS Cognito
Burner Mail - One-click burner email addresses that you can use when signing up on websites to protect your identity and prevent your personal email address from being sold or spammed.