Add a random assortment of GR2-related submodules

.gitmodules

@@ -133,3 +133,30 @@
 [submodule "Servers/ProjectHorizon"]
 	path = Servers/ProjectHorizon
 	url = http://lab.projecthorizon.xyz/horizon/horizon.git
+[submodule "Tools/gr2-web"]
+	path = Tools/gr2-web
+	url = https://github.com/herenow/gr2-web.git
+[submodule "Tools/opengr2-bevy"]
+	path = Tools/opengr2-bevy
+	url = https://github.com/NoFr1ends/opengr2-bevy.git
+[submodule "Tools/opengr2-viewer"]
+	path = Tools/opengr2-viewer
+	url = https://github.com/NoFr1ends/opengr2-viewer.git
+[submodule "Tools/opengr2-rs"]
+	path = Tools/opengr2-rs
+	url = https://github.com/NoFr1ends/opengr2-rs.git
+[submodule "Tools/opengr2"]
+	path = Tools/opengr2
+	url = https://github.com/arves100/opengr2.git
+[submodule "Tools/Granny2-research"]
+	path = Tools/Granny2-research
+	url = https://github.com/arves100/Granny2-research.git
+[submodule "Tools/GrannyConverterLibrary"]
+	path = Tools/GrannyConverterLibrary
+	url = https://github.com/Anohros/GrannyConverterLibrary.git
+[submodule "Tools/liboodle"]
+	path = Tools/liboodle
+	url = https://github.com/LunaticInAHat/liboodle.git
+[submodule "Tools/Knit"]
+	path = Tools/Knit
+	url = https://github.com/yretenai/Knit.git