I couldn't list here all platforms and tools that I have used or that I currently use, during a couple of decades building software plus those years while learning as a kid, the list would be way too long. Also, I would have to include things like MSX Basic, Delphi, dBase and FoxPro , which I won't :). But here is a list nonetheless. 

Programming Languages
  • C#
  • F#
  • Javascript
  • C, C++
  • Java
  • Visual Studio
  • MonoDevelop
  • Xamarin Studio
  • XCode
  • ASP.NET Web Forms
  • ASP.NET Core
  • JQuery
  • Bootstrap
  • React.JS
  • Angular.JS
  • JSON
  • HTML5
  • Silverlight
Web Services/Web APIs
  • Micro-Service architecture
  • RESTful Web Services/APIs
  • WCF
  • Windows Forms Controls and Components
  • Windows Presentation Foundation
  • GTK#
Mobile Devices 
  • Windows Mobile Legacy applications using .NET Compact Framework
  • Windows Phone 7/8 development with Silverlight XAML/C#
  • Windows 10 Mobile development
  • Universal Windows Platform
  • Xamarin.iOS
  • Xamarin.Android
  • Xamarin.Forms
  • CocosSharp game development iOS/Android/Windows
Computer Networks
  • Designing, Assembling and Managing of Computer Networks
  • Developing of Peer to Peer, Instant Messaging and Video/Audio streaming applications
  • Specialization in Service Oriented Architecture and micro-services.
Databases (SQL and NO-SQL)
  • MS-SQL Server
  • MySQL
  • SQLite
  • CouchBase
Geographic Information Systems
  • ArcGIS Server, ArcMap
  • WMS Web Services
  • ArcGIS API for JavaScript, C#, Silverlight
Agile/Team Development
  • Team Foundation Server
  • TeamCity/YouTrack for CI systems
Parallel Programming and high performance computing
  • OpenMP
  • Task Parallel Library
  • Developed and published coordination platforms under LINDA model
  • Developed and published a volunteer computing platform
  • RabbitMQ
  • Docker
  • Telerik (Windows Forms, WPF, Silverlight, AJAX, Web Forms, MVC and Windows Phone/Mobile)
  • Kendo UI