There are 2 repositories under messagebox topic.
Messagebox for AvaloniaUI
An update to Component factory's krypton toolkit to support .NET Framework 4.6.2 - 4.8.1 to .NET 8 - 9
A fully customizable messagebox for customtkinter! (extension/add-on)
Enable css for avalonia.
A companion toolkit for the standard toolkit.
Shows how to use wxWidgets controls only by programming code (c++17).
A update to Component factory's krypton toolkit to support the .NET 4.7 framework.
Shows how to use Win32 controls by programming code (c++17).
An extension to the Krypton Toolkit suite of controls for .NET framework 4.7
The MessageBox for WPF and WinForms application by the ability to blurring that parent form
The MessageBox which automatically closes after the specific timeout.
StylishWidget is a library for an Android Application project to make the UI more beautiful and allow to use third party font. This library also contain few view that created by me.
A drop-in replacement for System.Windows.MessageBox using a modern WPF UI.
A update to Component factory's krypton toolkit to support .NET Framework 3.5 to .NET Core
A Large Repository Of Awesome Code For Java.
InformationBox is an alternative to the default MessageBox included in the System.Windows.Forms namespace
Simple Qt popup messagebox based on Evileg PopUp notification, link: https://evileg.com/en/post/146/
Enhanced MessageBox for Windows Desktop (WinForms/WPF)
Build cool Dialogs with PowerShell and WPF
Customize your messagebox
:speech_balloon: beautiful, simply, alternative to MessageBox class.
An simple and beautiful message box for WPF applications
Show ContentDialog in a separate window in WinUI 3.
A highly customizable MessageBox pop-up for Avalonia with pre-set and custom buttons and plenty of layout options.
ArdeshirV.Forms is a customized version of everyday windows .Net forms like About Box, Error Handler, Splash Screen and my base windows form with many fantastic ability.
Apply dark theme to your built-in MsgBox and InputBox.
OpenFileDialog, SaveFileDialog, SelectFolderDialog & MessageBox
Shows how to use .Net Framework controls without RAD only by programming code : Console, Gui (WinForms) and unit tests (CSharp)
A new Theme (Android Material Design) for Windows Message Boxes (by hooking)
Wrapper for the Electron showMessageBox function which works with button objects instead of indexes.
Highly imitating Windows Message Box by using CSS + HTML. 用CSS + HTML高仿Windows信息框。
Library on .NET Core 3.1 implementing material design message box in WPF.
CustomTkinterMessagebox is a Python library that provides a customizable message box functionality for Tkinter-based applications. It allows developers to easily create message boxes with custom text, buttons, and optional sound effects.