What are some alternatives?
When comparing GroupDocs and appenguin, you can also consider the following products
FileAgo - Secure file storage and collaboration solution for teams
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Microsoft OneDrive - Secure access, sharing & file storage
Codefreebnb - Airbnb clone. Written with not one line of code
TeamWox - TeamWox is a groupware system designed to optimize the business management.
Website 2 APK Builder - Convert your HTML, CSS, JS and all other web content into an Android App within seconds.