find all websites with keyword .de/register?invite in the url

I can't browse the internet or access real-time data, so I'm unable to find specific websites or URLs for you. However, you can easily perform this search yourself by using a search engine. To find URLs with the keyword `.de/register?invite`, you can do the following: 1. Open a search engine like Google. 2. Enter the search query as follows: `site:.de register?invite`. This will show you results with `.de` domains that contain the specified parameters in the URL. Remember to enclose the search phrase in quotes if you want to search for that exact phrase. If you're looking for specific websites or services that utilize this type of registration link, you'd need to check with relevant communities or forums related to the service you have in mind.