diff --git a/.gitmodules b/.gitmodules
index caac6751..6128783a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,12 +7,6 @@
 [submodule "barstools"]
 	path = tools/barstools
 	url = https://github.com/ucb-bar/barstools.git
-[submodule "tools/chisel3"]
-	path = tools/chisel3
-	url = https://github.com/freechipsproject/chisel3.git
-[submodule "tools/firrtl"]
-	path = tools/firrtl
-	url = https://github.com/freechipsproject/firrtl
 [submodule "tools/torture"]
 	path = tools/torture
 	url = https://github.com/ucb-bar/riscv-torture.git
@@ -77,15 +71,9 @@
 [submodule "tools/chisel-testers"]
 	path = tools/chisel-testers
 	url = https://github.com/freechipsproject/chisel-testers.git
-[submodule "tools/treadle"]
-	path = tools/treadle
-	url = https://github.com/freechipsproject/treadle.git
 [submodule "generators/sha3"]
 	path = generators/sha3
 	url = https://github.com/ucb-bar/sha3.git
-[submodule "tools/firrtl-interpreter"]
-	path = tools/firrtl-interpreter
-	url = https://github.com/freechipsproject/firrtl-interpreter.git
 [submodule "vlsi/hammer-cadence-plugins"]
 	path = vlsi/hammer-cadence-plugins
 	url = https://github.com/ucb-bar/hammer-cadence-plugins.git
diff --git a/tools/chisel3 b/tools/chisel3
deleted file mode 160000
index 58d38f96..00000000
--- a/tools/chisel3
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 58d38f9620e7e91e4668266686484073c0ba7d2e
diff --git a/tools/firrtl b/tools/firrtl
deleted file mode 160000
index 7756f8f9..00000000
--- a/tools/firrtl
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 7756f8f9634b68a1375d2c2ca13abc5742234201
diff --git a/tools/firrtl-interpreter b/tools/firrtl-interpreter
deleted file mode 160000
index 5ab0cfe7..00000000
--- a/tools/firrtl-interpreter
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 5ab0cfe7020ca17804078c85d020730764ee176f
diff --git a/tools/treadle b/tools/treadle
deleted file mode 160000
index 925687ad..00000000
--- a/tools/treadle
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 925687ad22c42dd2c8b4dc127c0476f9902b3163