What are some alternatives?
When comparing Crystal and Go.CD, you can also consider the following products
BlockBear - Block ads and protect your privacy on iOS with a bear
NIM - GB64.COM is the home of The Gamebase Collection of C64 games.
StopAd PRO - The ultimate ad blocker for Windows and Mac.
Rust - A safe, concurrent, practical language
Goodly - Student loan repayment as a employer benefit
Elixir - Dynamic, functional language designed for building scalable and maintainable applications