diff --git a/cmssw-tool-conf.spec b/cmssw-tool-conf.spec
index 075361c7e13..a391617b232 100644
--- a/cmssw-tool-conf.spec
+++ b/cmssw-tool-conf.spec
@@ -40,14 +40,12 @@ Requires: hector
 Requires: hepmc
 Requires: hepmc3
 Requires: heppdt
-Requires: herwig
 Requires: herwig7
 Requires: hydjet
 Requires: hydjet2
 Requires: ittnotify
 Requires: jemalloc
 Requires: jemalloc-debug
-Requires: jimmy
 Requires: json
 Requires: ktjet
 Requires: lhapdf
diff --git a/herwig-6.520-tauoladummy.patch b/herwig-6.520-tauoladummy.patch
deleted file mode 100644
index 7a5ccc0d6d3..00000000000
--- a/herwig-6.520-tauoladummy.patch
+++ /dev/null
@@ -1,59 +0,0 @@
---- orig.herwig/6.520/dummy/Makefile.am	2010-10-28 17:52:56.000000000 +0200
-+++ herwig/6.520/dummy/Makefile.am	2010-10-28 17:54:15.000000000 +0200
-@@ -3,20 +3,13 @@
- circes.f \
- circgg.f \
- decadd.f \
--dexay.f \
- eudini.f \
- fragmt.f \
- hvcbvi.f \
- hvhbvi.f \
- hwhvvj.f \
- ieupdg.f \
--inietc.f \
--inimas.f \
--iniphx.f \
--initdk.f \
- ipdgeu.f \
--phoini.f \
--photos.f \
- qqinit.f \
- timel.f \
- upevnt.f \
---- orig.herwig/6.520/dummy/Makefile.in	2010-10-28 17:52:56.000000000 +0200
-+++ herwig/6.520/dummy/Makefile.in	2010-10-28 19:33:19.000000000 +0200
-@@ -57,10 +57,9 @@
- libLTLIBRARIES_INSTALL = $(INSTALL)
- LTLIBRARIES = $(lib_LTLIBRARIES)
- libherwig_dummy_la_LIBADD =
--am__objects_1 = circee.lo circes.lo circgg.lo decadd.lo dexay.lo \
-+am__objects_1 = circee.lo circes.lo circgg.lo decadd.lo \
- 	eudini.lo fragmt.lo hvcbvi.lo hvhbvi.lo hwhvvj.lo ieupdg.lo \
--	inietc.lo inimas.lo iniphx.lo initdk.lo ipdgeu.lo phoini.lo \
--	photos.lo qqinit.lo timel.lo upevnt.lo upinit.lo
-+	ipdgeu.lo qqinit.lo timel.lo upevnt.lo upinit.lo 
- am_libherwig_dummy_la_OBJECTS = $(am__objects_1)
- libherwig_dummy_la_OBJECTS = $(am_libherwig_dummy_la_OBJECTS)
- DEFAULT_INCLUDES = -I. -I$(srcdir) -I$(top_builddir)/config
-@@ -176,20 +175,13 @@
- circes.f \
- circgg.f \
- decadd.f \
--dexay.f \
- eudini.f \
- fragmt.f \
- hvcbvi.f \
- hvhbvi.f \
- hwhvvj.f \
- ieupdg.f \
--inietc.f \
--inimas.f \
--iniphx.f \
--initdk.f \
- ipdgeu.f \
--phoini.f \
--photos.f \
- qqinit.f \
- timel.f \
- upevnt.f \
diff --git a/herwig.spec b/herwig.spec
deleted file mode 100644
index f87ee531182..00000000000
--- a/herwig.spec
+++ /dev/null
@@ -1,40 +0,0 @@
-### RPM external herwig 6.521
-Source: http://cern.ch/service-spi/external/MCGenerators/distribution/%{n}/%{n}-%{realversion}-src.tgz
-Requires: lhapdf photos 
-Patch1: herwig-6.520-tauoladummy
-
-%define keep_archives true
-
-%prep
-%setup -q -n %n/%{realversion}
-F77="$(which gfortran) -fPIC"
-PLATF_CONFIG_OPTS="--disable-shared --enable-static"
-
-%patch1 -p2
-
-# Update to detect aarch64 and ppc64le
-rm -f ./config/config.{sub,guess}
-%get_config_sub ./config/config.sub
-%get_config_guess ./config/config.guess
-chmod +x ./config/config.{sub,guess}
-
-./configure $PLATF_CONFIG_OPTS --prefix=%i F77="$F77"
-
-%build
-make %{makeprocesses} LHAPDF_ROOT=$LHAPDF_ROOT PHOTOS_ROOT=$PHOTOS_ROOT
-
-make check
-
-%install
-make install
-
-# then hack include area as jimmy depends on missing header file..
-# but only on slc*. On macosx HERWIG65.INC == herwig65.inc
-# what is actually needed is a link to herwig6510.inc
-%ifos darwin
-ln -sf herwig6521.inc %{i}/include/herwig65.inc
-%else
-ln -sf HERWIG65.INC %{i}/include/herwig65.inc
-%endif
-
-rm -rf %i/lib/*.la
diff --git a/jimmy-4.2-configure-update.patch b/jimmy-4.2-configure-update.patch
deleted file mode 100644
index ddfca47915d..00000000000
--- a/jimmy-4.2-configure-update.patch
+++ /dev/null
@@ -1,61 +0,0 @@
-diff --git a/4.2/configure b/4.2/configure
-index fa2cbb5..1f82871 100755
---- a/4.2/configure
-+++ b/4.2/configure
-@@ -82,7 +82,7 @@ check_arguments $*
- #fi
- #Platform & opt/dbg - independent flags and variables:
- 
--export FFLAGS="${FFLAGS} -Wno-globals"
-+export FFLAGS="${FFLAGS}"
- 
- FFLAGSSHARED=-fPIC
- CFLAGSSHARED=-fPIC
-@@ -92,17 +92,17 @@ CFLAGSSHARED=-fPIC
- export LDFLAGS=" -pthread -fPIC"
- 
- ARCH=`uname`
--if [ ${ARCH} = "Linux" ]; then
--	export F77=g77
--	export FLIBS=" -lfrtbegin -lg2c "
--elif [ ${ARCH} = "Linux-gcc4" ]; then   # Linux platform with gcc4: new Fortran90 compiler.
--	export F77=gfortran
--	export FLIBS=" -lgfortran -lgfortranbegin "
--else
--	echo "Warning: unknown ARCH = $ARCH. Setting F77=f77, FLIBS=\"\"" 
--	export F77=f77
--	export FLIBS=""
--fi
-+case ${ARCH} in
-+  Linux)
-+    export F77=gfortran
-+    export FLIBS=" -lgfortran -lgfortranbegin "
-+  ;;
-+  *)
-+    echo "Warning: unknown ARCH = $ARCH. Setting F77=f77, FLIBS=\"\""
-+    export F77=f77
-+    export FLIBS=""
-+  ;;
-+esac
- 
- echo "Assuming the fortran compiler to be ... "$F77
- 
-diff --git a/4.2/src/Makefile b/4.2/src/Makefile
-index 5d52ef0..0e9d2d2 100644
---- a/4.2/src/Makefile
-+++ b/4.2/src/Makefile
-@@ -19,7 +19,13 @@ lib_archive: $(LIB_ARCHIVE)
- $(LIB_SHARED):  $(objects)
- 	mkdir -p $(LIBDIR_SHARED)
- 	@echo creating the shared library $@
--	$(F77) $(LDFLAGSSHARED) $(objects) -o $@ -shared -Wl,-soname,$(notdir $@)
-+	case `uname` in \
-+	   Linux*) \
-+		$(F77) $(LDFLAGSSHARED) $(objects) -o $@ -shared -Wl,-soname,$(notdir $@) ;; \
-+	   Darwin*) \
-+		$(F77) $(LDFLAGSSHARED) $(objects) -L$(HERWIG_ROOT)/lib -lherwig -o $@ -shared -dynamic -Wl,-commons -Wl,use_dylibs ;; \
-+	esac
-+
- 
- $(LIB_ARCHIVE) : $(objects)
- 	mkdir -p $(LIBDIR_ARCHIVE)
diff --git a/jimmy.spec b/jimmy.spec
deleted file mode 100644
index edaf36e9bda..00000000000
--- a/jimmy.spec
+++ /dev/null
@@ -1,25 +0,0 @@
-### RPM external jimmy 4.2
-
-Requires: herwig
-Source: http://service-spi.web.cern.ch/service-spi/external/MCGenerators/distribution/%{n}/%{n}-%{realversion}-src.tgz
-Patch0: jimmy-4.2-configure-update
-
-%define keep_archives true
-
-%prep
-%setup -q -n %{n}/%{realversion}
-%patch0 -p2
-
-%build
-./configure $PLATF_CONFIG_OPTS --with-herwig=$HERWIG_ROOT
-# Looks like ./configure does not do all it should do to have our
-# version of herwig picked up at link time.
-# Workaround until they fix the GENESER makefiles is to define
-# the variable and use it directly inside "Makeshared".
-make HERWIG_ROOT=$HERWIG_ROOT FFLAGS=-std=legacy lib_archive
-
-%install
-tar -c lib include | tar -x -C %i
-find %i/lib/archive -name "*.a" -exec mv {} %i/lib \;
-rm -rf %i/lib/archive
-
diff --git a/scram-tools.file/tools/herwig/herwig.xml b/scram-tools.file/tools/herwig/herwig.xml
deleted file mode 100644
index 62f1aa0ba75..00000000000
--- a/scram-tools.file/tools/herwig/herwig.xml
+++ /dev/null
@@ -1,14 +0,0 @@
-<tool name="herwig" version="@TOOL_VERSION@">
-  <lib name="herwig"/>
-  <lib name="herwig_dummy"/>
-  <client>
-    <environment name="HERWIG_BASE" default="@TOOL_ROOT@"/>
-    <environment name="LIBDIR" default="$HERWIG_BASE/lib"/>
-    <environment name="INCLUDE" default="$HERWIG_BASE/include"/>
-  </client>
-  <runtime name="ROOT_INCLUDE_PATH" value="$INCLUDE" type="path"/>
-  <use name="root_cxxdefaults"/>
-  <use name="f77compiler"/>
-  <use name="lhapdf"/>
-  <use name="photos"/>
-</tool>
diff --git a/scram-tools.file/tools/jimmy/jimmy.xml b/scram-tools.file/tools/jimmy/jimmy.xml
deleted file mode 100644
index 1fc0280c940..00000000000
--- a/scram-tools.file/tools/jimmy/jimmy.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<tool name="jimmy" version="@TOOL_VERSION@">
-  <lib name="jimmy"/>
-  <client>
-    <environment name="JIMMY_BASE" default="@TOOL_ROOT@"/>
-    <environment name="LIBDIR" default="$JIMMY_BASE/lib"/>
-  </client>
-  <use name="f77compiler"/>
-  <use name="herwig"/>
-  <use name="jimmy_headers"/>
-</tool>
diff --git a/scram-tools.file/tools/jimmy/jimmy_headers.xml b/scram-tools.file/tools/jimmy/jimmy_headers.xml
deleted file mode 100644
index a68d77429b8..00000000000
--- a/scram-tools.file/tools/jimmy/jimmy_headers.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<tool name="jimmy_headers" version="@TOOL_VERSION@">
-  <client>
-    <environment name="JIMMY_HEADERS_BASE" default="@TOOL_ROOT@"/>
-    <environment name="INCLUDE" default="$JIMMY_HEADERS_BASE/include"/>
-  </client>
-  <runtime name="ROOT_INCLUDE_PATH" value="$INCLUDE" type="path"/>
-  <use name="root_cxxdefaults"/>
-</tool>