diff --git a/.gitmodules b/.gitmodules
index 00469374..662c76f2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,9 @@
 [submodule "BinaryObjectScanner/_EXTERNAL/stormlibsharp"]
 	path = BinaryObjectScanner/_EXTERNAL/stormlibsharp
 	url = https://github.com/robpaveza/stormlibsharp.git
+[submodule "BinaryObjectScanner/_EXTERNAL/libmspack4n"]
+	path = BinaryObjectScanner/_EXTERNAL/libmspack4n
+	url = https://github.com/activescott/libmspack4n.git
+[submodule "BinaryObjectScanner/_EXTERNAL/LessIO"]
+	path = BinaryObjectScanner/_EXTERNAL/LessIO
+	url = https://github.com/activescott/LessIO.git
diff --git a/BinaryObjectScanner/_EXTERNAL/LessIO b/BinaryObjectScanner/_EXTERNAL/LessIO
new file mode 160000
index 00000000..3dcf2c14
--- /dev/null
+++ b/BinaryObjectScanner/_EXTERNAL/LessIO
@@ -0,0 +1 @@
+Subproject commit 3dcf2c147b219352c580ee9950e8ba1f3d1fbe27
diff --git a/BinaryObjectScanner/_EXTERNAL/libmspack4n b/BinaryObjectScanner/_EXTERNAL/libmspack4n
new file mode 160000
index 00000000..7213a361
--- /dev/null
+++ b/BinaryObjectScanner/_EXTERNAL/libmspack4n
@@ -0,0 +1 @@
+Subproject commit 7213a361f80bee1d96f428aceb5595977d024855