UI Widgets for Flutter is a set of ever-growing UI widgets package for developing rich and high-quality applications in iOS, Android and Web from a single code base, using Flutter framework. Now it includes the following widgets and libraries.

Flutter Widgets : Ready to use widgets (539 pcs)
Loaders (37 pcs)
Buttons (194 pcs) Flat Button, Floating Action Button, Icon Button, Outline Button
Sliders (13 pcs)
Menu(Drawer) (3 pcs)
Text (53 pcs)
Edit(TextField) (40 pcs)
Image (22 pcs)
CheckBox (48 pcs)
AppBar (35 pcs)
PageView (7 pcs)
Cupertino Dialog (2 pcs)
Standart dialog (11 pcs)
Pop up dialog (11 pcs)
BottomBar (12 pcs)
Cards (36 pcs)
Pagination (7 pcs)
DropDownButton (4 pcs)
Shimmer Effect (4 pcs)

Homepage

https://codecanyon.net/item/ui-kit-the-biggest-flutter-ui-widgets-components-pack/32069229