diff --git a/more/free-programming-playgrounds.md b/more/free-programming-playgrounds.md
index 03bf6dfcd..2b65d0b78 100644
--- a/more/free-programming-playgrounds.md
+++ b/more/free-programming-playgrounds.md
@@ -95,7 +95,9 @@
 * [Codeapi](https://codapi.org/csharp)
 * [CodeSandbox](https://codesandbox.io/s/c-z2m9v)
 * [Dotfiddlenet](https://dotnetfiddle.net)
+* [GDB](https://www.onlinegdb.com/online_csharp_compiler)
 * [Getvm](https://getvm.io/playgrounds/c-sharp-playground)
+* [myCompiler](https://www.mycompiler.io/online-csharp-compiler)
 * [Jdoodle](https://www.jdoodle.com/compile-c-sharp-online)
 * [Onecompiler](https://onecompiler.com/csharp/3wv9zujyk)
 * [OnlineGDB](https://www.onlinegdb.com/online_csharp_compiler)