SDL Contenta 5.7.1 includes no new features or enhancements.
Platform changes
What's new in SDL Contenta 5.7.1
New features and enhancements in Contenta S1000D 5.7.1
New features and enhancements in Contenta S1000D 5.8.1
What's new in SDL Contenta 5.1
New features and enhancements in Contenta S1000D 5.5.2