Platforms

Windows, Linux, Mac OS

Desktop programming

C++, STL

Qt

WinAPI, MFC, GDI/GDI+, COM, ATL, ActiveX, WinRT

.NET, C#, Windows.Forms, WPF, WCF

.NET Core

XML, XSLT

Python

Web programming

ASP.NET, ASP.NET MVC, HTML, JavaScript, AJAX, jQuery

Databases

ADO.NET, LINQ, Entity Framework

MS SQL Server, MS Access, SQLite, MySQL, SQL Anywhere