Looking for logging into the Developer Force Sign Up site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Developer Force Sign Up site. After that you can login as usual with your login credentials.
https://developer.salesforce.com/signup
https://developer.salesforce.com/forums/?id=906F0000000g30SIAQ
https://developer.salesforce.com/page/Registration_Issues
https://force.desk.com/customer/en/portal/articles/2871586-how-to-sign-up-for-trailhead-with-a-developer-edition
https://force.desk.com/customer/en/portal/articles/2643793-trailhead-profile-signup-login-faq?b_id=13478
https://www.youtube.com/user/DeveloperForce
https://workbench.developerforce.com/
https://developers.google.com/+/web/signin/
https://www.mockplus.com/blog/post/sign-up-login-design-practices
https://depot.xda-developers.com/sign_up
https://stackoverflow.com/questions/52243943/how-to-force-flutter-to-use-new-developer-certificate
https://techcrunch.com/2018/11/07/android-developers-can-now-force-users-to-update-their-apps/
https://developers.facebook.com/docs/plugins/registration/v3.2