Hiya everyone, its Aqua!
As of today, Build Team and Developer Applications are now open permanently on the SMPEarth Website, to make an application you need to have a confirmed account on the website which you can do by adding a authenticator to your account and logging onto the server on your connected account after you've made a website account.
Applications can be found at;
Build Team - https://www.smpearth.com/build-app/
Developer - https://www.smpearth.com/dev-app/
If you have any issues ...