Please note that the website only allows you to add specific software related websites and goes through approval so make sure you submit the right and correct website. Now, let's get started.
Go to: https://alternativeto.net/
2. Verify your email
3. Click on add new application
Fill in every steps possible and then you will see a section called tags, put your keywords there.Good thing is they even recommend famous tags!
After that a separate webpage will be created for your website, example: