diff --git a/scripts/generate_easystacks_for_existing_stack/json_to_easystacks.sh b/scripts/generate_easystacks_for_existing_stack/json_to_easystacks.sh
new file mode 100755
index 0000000000..31a524e5a8
--- /dev/null
+++ b/scripts/generate_easystacks_for_existing_stack/json_to_easystacks.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+input_file=$1
+
+prev_eb_version="0.0.0"
+#prev_toolchain="none"
+easystack_num=0
+
+while read app
+do
+  eval $(echo $app | jq -r '. | to_entries | .[] | .key + "=" + (.value | @sh)')
+
+  #if [[ ${prev_toolchain} != ${toolchain} ]] || [[ ${prev_eb_version} != ${easybuild} ]]; then
+  if [[ ${prev_eb_version} != ${easybuild} ]]; then
+    easystack_num=$(( easystack_num + 1))
+    #prev_toolchain=${toolchain}
+    prev_eb_version=${easybuild}
+  fi
+
+  #easystack="$(printf '%03d\n' ${easystack_num})-eb-${easybuild}-${toolchain}.yml"
+  easystack="$(printf '%03d\n' ${easystack_num})-eb-${easybuild}.yml"
+  if [ ! -f "${easystack}" ]; then
+    echo "easyconfigs:" > ${easystack}
+  fi
+  echo "  - ${easyconfig}:" >> ${easystack}
+  echo "      options:" >> ${easystack}
+  echo "        include-easyblocks: ${easyblocks}" >> ${easystack}
+done < <(jq -c '.[]' ${input_file})
diff --git a/scripts/generate_easystacks_for_existing_stack/json_to_easystacks_split_by_duration.sh b/scripts/generate_easystacks_for_existing_stack/json_to_easystacks_split_by_duration.sh
new file mode 100755
index 0000000000..42ae5f8b6a
--- /dev/null
+++ b/scripts/generate_easystacks_for_existing_stack/json_to_easystacks_split_by_duration.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+input_file=$1
+duration_threshold=${2:-180}  # Default threshold to 180 minutes if not given
+
+prev_eb_version="0.0.0"
+easystack_num=0
+current_duration_sum=0
+total_duration_sum=0
+current_stack_name=""
+
+while read app; do
+  # Extract JSON keys to shell variables
+  eval $(echo $app | jq -r '. | to_entries | .[] | .key + "=" + (.value | @sh)')
+
+  # Check if we need to start a new easystack
+  if [[ ${prev_eb_version} != ${easybuild} ]] || (( current_duration_sum + build_duration_minutes > duration_threshold )); then
+    if [[ ${current_stack_name} != "" ]]; then
+      { echo "# ${current_stack_name}: total build duration = ${current_duration_sum} minutes"; cat "${easystack}"; } > temp && mv temp "${easystack}"
+    fi
+    easystack_num=$(( easystack_num + 1 ))
+    prev_eb_version=${easybuild}
+    current_duration_sum=0
+    current_stack_name="$(printf '%03d\n' ${easystack_num})-eb-${easybuild}.yml"
+  fi
+
+  easystack="${current_stack_name}"
+  if [[ ! -f "${easystack}" ]]; then
+    echo "easyconfigs:" > "${easystack}"
+  fi
+
+  echo "  - ${easyconfig}:" >> "${easystack}"
+  echo "      options:" >> "${easystack}"
+  echo "        include-easyblocks: ${easyblocks}" >> "${easystack}"
+
+  current_duration_sum=$(( current_duration_sum + build_duration_minutes ))
+  total_duration_sum=$(( total_duration_sum + build_duration_minutes ))
+
+done < <(jq -c '.[]' "${input_file}")
+
+# Print final stack duration
+if [[ ${current_stack_name} != "" ]]; then
+  { echo "# ${current_stack_name}: total build duration = ${current_duration_sum} minutes"; cat "${easystack}"; } > temp && mv temp "${easystack}"
+fi
+
+for file in *.yml; do
+  cat "$file" | head -n 1
+done
+
+# Print overall total
+echo "Overall total build duration = ${total_duration_sum} minutes"
diff --git a/scripts/generate_easystacks_for_existing_stack/stack_to_json.sh b/scripts/generate_easystacks_for_existing_stack/stack_to_json.sh
new file mode 100755
index 0000000000..89b5aa8c96
--- /dev/null
+++ b/scripts/generate_easystacks_for_existing_stack/stack_to_json.sh
@@ -0,0 +1,84 @@
+#!/bin/bash
+
+DEBUG=0
+BASE_STACK=/cvmfs/software.eessi.io/versions/2023.06/software/linux/x86_64/intel/haswell/software
+EB_BOOTSTRAP=4.9.4
+
+declare -A gcc_to_foss=( ["12.2.0"]="2022b" ["12.3.0"]="2023a" ["13.2.0"]="2023b" )
+
+if [[ ! -d ${BASE_STACK} ]]; then
+  echo "The given base stack (${BASE_STACK}) is not a directory."
+  exit 1
+fi
+
+apps=$(find ${BASE_STACK} -mindepth 2 -maxdepth 2 -type d)
+
+json_output="["
+for app_dir in $apps; do
+  app_version=$(basename ${app_dir})
+  app_name=$(basename $(dirname ${app_dir}))
+
+  if [[ ${app_name} == "EESSI-extend" ]]; then
+    # Skip EESSI-extend, as it will be installed automatically.
+    continue
+  fi
+
+  easyblocks=${app_dir}/easybuild/reprod/easyblocks/*.py
+  easyconfig=${app_dir}/easybuild/${app_name}-${app_version}.eb
+  if [[ ! -f ${easyconfig} ]]; then
+    echo "ERROR: cannot find easyconfig for ${app_name}/${app_version}"
+  fi
+  # If rebuilds would not remove the original log file, we should take the build time from the first log.
+  # As we cannot guarantee that at the moment, we are cautious and use the last one.
+  log_file=$(ls -1 ${app_dir}/easybuild/easybuild-${app_name}*.log* | tail -n 1)
+  build_time_start=$(bzcat ${log_file} | head -n 1 | awk '{print $2 "T" $3}' | cut -d, -f1)
+  build_time_end=$(bzcat ${log_file} | tail -n 1 | awk '{print $2 "T" $3}' | cut -d, -f1)
+  #build_time_unix=$( date +%s -d ${build_time})
+  build_duration=$(( ($(date +%s -d ${build_time_end}) - $(date +%s -d ${build_time_start}))/60 ))
+
+  eb_version=$(bzgrep -oP "This is EasyBuild \K([0-9].[0-9].[0-9])" ${log_file} | head -n 1)
+  # Some EB versions have been installed with a temporary EB installation of the same version.
+  # If that's the case, use the version specified with ${EB_BOOTSTRAP} instead.
+  # This needs to correspond to the version that gets installed initially by EESSI-install-software.sh,
+  # which should be the latest EB version available when that script is being run.
+  if [[ ${app_name} == "EasyBuild" ]] && [[ ${app_version} == ${eb_version} ]]; then
+    eb_version=${EB_BOOTSTRAP}
+  fi
+
+  if [[ ${app_version} != *-* ]]; then
+    toolchain=SYSTEM
+  else
+    if [[ ${app_version} == *-GCC* ]]; then
+      gcc_ver=$(echo ${app_version} | grep -oP "(GCC|GCCcore)-\K.*?(?=-|$)")
+      toolchain=${gcc_to_foss[$gcc_ver]}
+    else
+      toolchain=$(echo ${app_version} | grep -oP "(foss|gfbf|gompi)-\K.*?(?=-|$)")
+    fi
+  fi
+
+  json=$(
+    jq --null-input \
+      --arg build_time "${build_time_start}" \
+      --arg build_duration_minutes "${build_duration}" \
+      --arg name "${app_name}" \
+      --arg version "${app_version}" \
+      --arg easybuild "${eb_version}" \
+      --arg toolchain  "${toolchain}" \
+      --arg easyconfig  "${easyconfig}" \
+      --arg easyblocks  "${easyblocks}" \
+      '$ARGS.named' # requires jq 1.7 or newer
+      #'{build_time: $build_time, build_duration_minutes: $build_duration, name: $name, version: $version, easybuild: $easybuild,
+      #  toolchain: $toolchain, easyconfig: $easyconfig, easyblocks: $easyblocks}'
+  )
+
+  if [[ ${json_output} == "[" ]]; then
+    json_output="${json_output}${json}"
+  else
+    json_output="${json_output},${json}"
+  fi
+  [[ ${DEBUG} -ne 0 ]] && echo ${build_time_unix} ${app_name} ${app_version} ${eb_version} ${toolchain} ${easyconfig} ${easyblocks}
+done #| sort -nu
+json_output="${json_output}]"
+
+[[ ${DEBUG} -ne 0 ]] && echo ${json_output}
+echo ${json_output} | jq 'sort_by(.build_time)'
diff --git a/scripts/generate_easystacks_for_existing_stack/stack_to_json_parallel.sh b/scripts/generate_easystacks_for_existing_stack/stack_to_json_parallel.sh
new file mode 100755
index 0000000000..813a4941af
--- /dev/null
+++ b/scripts/generate_easystacks_for_existing_stack/stack_to_json_parallel.sh
@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Usage: ./script.sh [MAX_JOBS]
+MAX_JOBS=${1:-4}  # Default to 4 concurrent jobs if not specified
+DEBUG=0
+BASE_STACK=/cvmfs/software.eessi.io/versions/2023.06/software/linux/x86_64/intel/haswell/software
+EB_BOOTSTRAP=5.0.0
+TMPDIR=$(mktemp -d)
+
+declare -A gcc_to_foss=( ["12.2.0"]="2022b" ["12.3.0"]="2023a" ["13.2.0"]="2023b" )
+
+if [[ ! -d ${BASE_STACK} ]]; then
+  echo "The given base stack (${BASE_STACK}) is not a directory."
+  exit 1
+fi
+
+apps=$(find ${BASE_STACK} -mindepth 2 -maxdepth 2 -type d)
+
+# Job limiter
+job_count=0
+run_limited() {
+  ((job_count++))
+  if (( job_count >= MAX_JOBS )); then
+    wait -n  # wait for one job to finish
+    ((job_count--))
+  fi
+}
+
+for app_dir in $apps; do
+run_limited
+(
+  app_version=$(basename "${app_dir}")
+  app_name=$(basename "$(dirname "${app_dir}")")
+
+  if [[ ${app_name} == "EESSI-extend" ]]; then
+    exit 0
+  fi
+
+  easyblocks=${app_dir}/easybuild/reprod/easyblocks/*.py
+  easyconfig=${app_dir}/easybuild/${app_name}-${app_version}.eb
+
+  if [[ ! -f ${easyconfig} ]]; then
+    echo "ERROR: cannot find easyconfig for ${app_name}/${app_version}" >&2
+    exit 1
+  fi
+
+  log_file=$(ls -1 ${app_dir}/easybuild/easybuild-${app_name}*.log* 2>/dev/null | tail -n 1)
+  build_time_start=$(bzcat "${log_file}" | head -n 1 | awk '{print $2 "T" $3}' | cut -d, -f1)
+  build_time_end=$(bzcat "${log_file}" | tail -n 1 | awk '{print $2 "T" $3}' | cut -d, -f1)
+  build_duration=$(( ($(date +%s -d "${build_time_end}") - $(date +%s -d "${build_time_start}")) / 60 ))
+
+  eb_version=$(bzgrep -oP "This is EasyBuild \K([0-9]+\.[0-9]+\.[0-9]+)" "${log_file}" | head -n 1)
+  if [[ ${app_name} == "EasyBuild" ]] && [[ ${app_version} == ${eb_version} ]]; then
+    eb_version=${EB_BOOTSTRAP}
+  fi
+
+  if [[ ${app_version} != *-* ]]; then
+    toolchain="SYSTEM"
+  else
+    if [[ ${app_version} == *-GCC* ]]; then
+      gcc_ver=$(echo ${app_version} | grep -oP "(GCC|GCCcore)-\K.*?(?=-|$)")
+      toolchain=${gcc_to_foss[$gcc_ver]}
+    else
+      toolchain=$(echo ${app_version} | grep -oP "(foss|gfbf|gompi)-\K.*?(?=-|$)")
+    fi
+  fi
+
+  jq --null-input \
+    --arg build_time "${build_time_start}" \
+    --arg build_duration_minutes "${build_duration}" \
+    --arg name "${app_name}" \
+    --arg version "${app_version}" \
+    --arg easybuild "${eb_version}" \
+    --arg toolchain  "${toolchain}" \
+    --arg easyconfig  "${easyconfig}" \
+    --arg easyblocks  "${easyblocks}" \
+    '$ARGS.named' > "${TMPDIR}/${app_name}_${app_version}.json"
+
+  [[ ${DEBUG} -ne 0 ]] && echo "Processed ${app_name}/${app_version}" >&2
+) &
+done
+
+wait
+
+# Combine all results and sort by build time
+jq -s 'sort_by(.build_time)' "${TMPDIR}"/*.json
+
+# Optional cleanup
+rm -r "${TMPDIR}"
+