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There's nothing best like the official explanation:
- Mashups: https://help.qlik.com/en-US/sense-developer/3.1/Subsystems/Mashups/Content/mashups-introduction.htm
- Extensions: https://help.qlik.com/en-US/sense-developer/3.1/Subsystems/Extensions/Content/extensions-introduction.htm
- Widgets: https://help.qlik.com/en-US/sense-developer/3.1/Subsystems/Extensions/Content/widgets-introduction.htm
Note that this links are valid for Qlik Sense 3.1, if there are any additions or changes those will be reflected in the helps site.