diff --git a/tools/check.sh b/.dev-tools/linting/check-filenames-permalinks.sh
similarity index 100%
rename from tools/check.sh
rename to .dev-tools/linting/check-filenames-permalinks.sh
diff --git a/tools/check-image-names.py b/.dev-tools/linting/check-image-names.py
similarity index 100%
rename from tools/check-image-names.py
rename to .dev-tools/linting/check-image-names.py
diff --git a/tools/check-links-to-precice.sh b/.dev-tools/linting/check-links-to-precice.sh
similarity index 100%
rename from tools/check-links-to-precice.sh
rename to .dev-tools/linting/check-links-to-precice.sh
diff --git a/tools/check-size.sh b/.dev-tools/linting/check-size.sh
similarity index 100%
rename from tools/check-size.sh
rename to .dev-tools/linting/check-size.sh
diff --git a/tools/releasing/README.md b/.dev-tools/releasing/README.md
similarity index 61%
rename from tools/releasing/README.md
rename to .dev-tools/releasing/README.md
index fc0741a86..5389adf5a 100644
--- a/tools/releasing/README.md
+++ b/.dev-tools/releasing/README.md
@@ -1,5 +1,13 @@
 # Releasing helpers
 
+## Config visualization
+
+The `visualize-configs.sh` script iterates over all tutorial cases and updates the visualizations of the `precice-config.xml` files.
+
+Run it from the root tutorials directory in serial (`./visualize-configs.sh`) or in parallel (`./visualize-configs.sh -parallel`).
+
+If not already available, the script will install the `precice-config-visualizer` in a Python virtual environment.
+
 ## Python dependency reference files
 
 Each Python participant lists dependencies in its local `requirements.txt` using loose version ranges (for example `numpy >1, <2`, `pyprecice~=3.0`). Tutorial `run.sh` scripts install from these files as before.
@@ -10,20 +18,20 @@ Next to each `requirements.txt`, a sibling `requirements-reference.txt` records
 pip install -r requirements-reference.txt
 ```
 
-This tool lives under `tools/releasing/` and depends on:
+This tool lives under `.dev-tools/releasing/` and depends on:
 
 ```bash
-pip install -r tools/releasing/requirements.txt
+pip install -r .dev-tools/releasing/requirements.txt
 ```
 
 Update reference files after changing `requirements.txt` files. By default, only files whose resolved package pins changed are rewritten (timestamps alone do not create a diff). Use `--all` to force a full refresh, or pass a path to limit the update to one directory:
 
 ```bash
-python3 tools/releasing/update-requirements-reference.py
-python3 tools/releasing/update-requirements-reference.py path/to/participant
-python3 tools/releasing/update-requirements-reference.py --all
-python3 tools/releasing/update-requirements-reference.py --check
-python3 tools/releasing/update-requirements-reference.py --check --fail-on-outdated
+python3 .dev-tools/releasing/update-requirements-reference.py
+python3 .dev-tools/releasing/update-requirements-reference.py path/to/participant
+python3 .dev-tools/releasing/update-requirements-reference.py --all
+python3 .dev-tools/releasing/update-requirements-reference.py --check
+python3 .dev-tools/releasing/update-requirements-reference.py --check --fail-on-outdated
 ```
 
 With `--check`, the tool fails when a sibling `requirements-reference.txt` is missing, and warns when pins are outdated. The `--fail-on-outdated` option turns outdated pins into errors (used for release PRs to `master`).
diff --git a/tools/releasing/requirements-reference.txt b/.dev-tools/releasing/requirements-reference.txt
similarity index 100%
rename from tools/releasing/requirements-reference.txt
rename to .dev-tools/releasing/requirements-reference.txt
diff --git a/tools/releasing/requirements.txt b/.dev-tools/releasing/requirements.txt
similarity index 100%
rename from tools/releasing/requirements.txt
rename to .dev-tools/releasing/requirements.txt
diff --git a/tools/releasing/update-requirements-reference.py b/.dev-tools/releasing/update-requirements-reference.py
similarity index 95%
rename from tools/releasing/update-requirements-reference.py
rename to .dev-tools/releasing/update-requirements-reference.py
index 972a22ae2..5042d78cc 100644
--- a/tools/releasing/update-requirements-reference.py
+++ b/.dev-tools/releasing/update-requirements-reference.py
@@ -7,11 +7,11 @@
 requirements-reference.txt next to each file.
 
 Run from the repository root:
-  python3 tools/releasing/update-requirements-reference.py
-  python3 tools/releasing/update-requirements-reference.py --all
-  python3 tools/releasing/update-requirements-reference.py path/to/dir
-  python3 tools/releasing/update-requirements-reference.py --check
-  python3 tools/releasing/update-requirements-reference.py --check --fail-on-outdated
+  python3 .dev-tools/releasing/update-requirements-reference.py
+  python3 .dev-tools/releasing/update-requirements-reference.py --all
+  python3 .dev-tools/releasing/update-requirements-reference.py path/to/dir
+  python3 .dev-tools/releasing/update-requirements-reference.py --check
+  python3 .dev-tools/releasing/update-requirements-reference.py --check --fail-on-outdated
 """
 from __future__ import annotations
 
@@ -31,7 +31,7 @@
 
 REPO_ROOT = Path(__file__).resolve().parent.parent.parent
 REFERENCE_NAME = "requirements-reference.txt"
-SCRIPT_RELATIVE = "tools/releasing/update-requirements-reference.py"
+SCRIPT_RELATIVE = ".dev-tools/releasing/update-requirements-reference.py"
 # Empty by default: every tracked requirements.txt gets a sibling reference file.
 EXCLUDED_RELATIVE: set[str] = set()
 
diff --git a/tools/visualize-configs.sh b/.dev-tools/releasing/visualize-configs.sh
similarity index 100%
rename from tools/visualize-configs.sh
rename to .dev-tools/releasing/visualize-configs.sh
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index b4187f16e..84e0bd785 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -3,7 +3,7 @@ TODO: Summarize and motivate the changes, link to issues, remove the checklist e
 ## Checklist
 
 - [ ] I added a summary of any user-facing changes (compared to the last release) in the `changelog-entries/<PRnumber>.md`.
-- [ ] If I changed `requirements.txt` files, I regenerated sibling `requirements-reference.txt` files with `python3 tools/releasing/update-requirements-reference.py` (pass a path to update only that directory, or `--all` to refresh everything).
+- [ ] If I changed `requirements.txt` files, I regenerated sibling `requirements-reference.txt` files with `python3 .dev-tools/releasing/update-requirements-reference.py` (pass a path to update only that directory, or `--all` to refresh everything).
 
 For new tutorials or tutorial cases:
 
diff --git a/.github/workflows/check-requirements-reference.yml b/.github/workflows/check-requirements-reference.yml
index cb3f00f02..c536e0543 100644
--- a/.github/workflows/check-requirements-reference.yml
+++ b/.github/workflows/check-requirements-reference.yml
@@ -7,8 +7,8 @@ on:
     paths:
       - '**/requirements.txt'
       - '**/requirements-reference.txt'
-      - tools/releasing/update-requirements-reference.py
-      - tools/releasing/requirements.txt
+      - .dev-tools/releasing/update-requirements-reference.py
+      - .dev-tools/releasing/requirements.txt
 jobs:
   check:
     runs-on: ubuntu-latest
@@ -20,10 +20,10 @@ jobs:
         with:
           python-version: '3.10'
       - name: Install packaging
-        run: pip install -r tools/releasing/requirements.txt
+        run: pip install -r .dev-tools/releasing/requirements.txt
       - name: Check requirements-reference.txt files exist
         if: github.base_ref == 'develop'
-        run: python3 tools/releasing/update-requirements-reference.py --check
+        run: python3 .dev-tools/releasing/update-requirements-reference.py --check
       - name: Check requirements-reference.txt files are up to date
         if: github.base_ref == 'master'
-        run: python3 tools/releasing/update-requirements-reference.py --check --fail-on-outdated
+        run: python3 .dev-tools/releasing/update-requirements-reference.py --check --fail-on-outdated
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 07afb69b3..453a6ae08 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -31,22 +31,22 @@ repos:
     - id: check-image-naming
       name: check image names
       language: python
-      entry: tools/check-image-names.py
+      entry: .dev-tools/linting/check-image-names.py
       files: ".*/images/.*"
     - id: check-size
       name: check sizes
       language: script
-      entry: tools/check-size.sh
+      entry: .dev-tools/linting/check-size.sh
       pass_filenames: false
     - id: check-names
       name: check file names
       language: script
-      entry: tools/check.sh
+      entry: .dev-tools/linting/check-filenames-permalinks.sh
       pass_filenames: false
     - id: check-links-to-precice
       name: check links to precice.org
       language: script
-      entry: tools/check-links-to-precice.sh
+      entry: .dev-tools/linting/check-links-to-precice.sh
       types_or: ["markdown", "html"]
 - repo: https://github.com/rhysd/actionlint
   rev: v1.7.12
diff --git a/README.md b/README.md
index 4c0104e34..3c47f7bbe 100644
--- a/README.md
+++ b/README.md
@@ -15,4 +15,4 @@ Contributions to this repository are very welcome. Please refer to the page [Con
 
 Note that we use [Git LFS](https://git-lfs.com/) to version reference results. These will appear as seemingly empty files containing URLs if you don't have Git LFS installed (optional, mainly useful for our system tests).
 
-For Python dependency ranges and the sibling `requirements-reference.txt` files used for reproducible installs, see [`tools/releasing/README.md`](tools/releasing/README.md).
+For Python dependency ranges and the sibling `requirements-reference.txt` files used for reproducible installs, see [`.dev-tools/releasing/README.md`](.dev-tools/releasing/README.md).
diff --git a/changelog-entries/610.md b/changelog-entries/610.md
index 01b8396c8..b2639e307 100644
--- a/changelog-entries/610.md
+++ b/changelog-entries/610.md
@@ -1 +1 @@
-- Add loose version constraints to tutorial `requirements.txt` files and sibling `requirements-reference.txt` pins generated from PyPI via `tools/releasing/update-requirements-reference.py`, with a CI check that requires reference files on `develop` and up-to-date pins on release PRs to `master` ([#871](https://github.com/precice/tutorials/pull/871)).
+- Add loose version constraints to tutorial `requirements.txt` files and sibling `requirements-reference.txt` pins generated from PyPI via `.dev-tools/releasing/update-requirements-reference.py`, with a CI check that requires reference files on `develop` and up-to-date pins on release PRs to `master` ([#871](https://github.com/precice/tutorials/pull/871)).
diff --git a/tools/cleaning-tools.sh b/tools/cleaning-tools.sh
old mode 100755
new mode 100644
diff --git a/tools/openfoam-remove-empty-dirs.sh b/tools/openfoam-remove-empty-dirs.sh
old mode 100755
new mode 100644