diff --git a/pkgs/by-name/gi/giza/package.nix b/pkgs/by-name/gi/giza/package.nix
new file mode 100644
index 0000000000000..1658970c8b335
--- /dev/null
+++ b/pkgs/by-name/gi/giza/package.nix
@@ -0,0 +1,42 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  autoreconfHook,
+  pkg-config,
+  gfortran,
+  cairo,
+  freetype,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "giza";
+  version = "1.4.1";
+
+  src = fetchFromGitHub {
+    owner = "danieljprice";
+    repo = "giza";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-spb46IoySf6DM454adcWmqqLlzNA2HK9z29TzOCECJ4=";
+  };
+
+  nativeBuildInputs = [
+    autoreconfHook
+    pkg-config
+    gfortran
+  ];
+
+  buildInputs = [
+    cairo
+    freetype
+  ];
+
+  meta = {
+    description = "Scientific plotting library for C/Fortran";
+    inherit (finalAttrs.src.meta) homepage;
+    changelog = "${finalAttrs.src.meta.homepage}/blob/${finalAttrs.src.rev}/ChangeLog";
+    license = lib.licenses.lgpl3Plus;
+    maintainers = with lib.maintainers; [ doronbehar ];
+    platforms = lib.platforms.all;
+  };
+})
diff --git a/pkgs/by-name/sp/splash/package.nix b/pkgs/by-name/sp/splash/package.nix
new file mode 100644
index 0000000000000..39d22a88b9d45
--- /dev/null
+++ b/pkgs/by-name/sp/splash/package.nix
@@ -0,0 +1,56 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  gfortran,
+  giza,
+  hdf5,
+  cairo,
+  freetype,
+  versionCheckHook,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "splash";
+  version = "3.10.3";
+
+  src = fetchFromGitHub {
+    owner = "danieljprice";
+    repo = "splash";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-5ieJHUWZDGgsNj7U9tbdhtDIsN+wgbs03IxVd1xM+hw=";
+  };
+
+  nativeBuildInputs = [
+    gfortran
+  ];
+
+  buildInputs = [
+    giza
+    cairo
+    freetype
+    hdf5
+  ];
+  makeFlags = [
+    "SYSTEM=gfortran"
+    "GIZA_DIR=${giza}"
+    "PREFIX=${placeholder "out"}"
+  ];
+  # Upstream's simplistic makefile doesn't even `mkdir $(PREFIX)`, so we help
+  # it:
+  preInstall = ''
+    mkdir -p $out/bin
+  '';
+  nativeInstallCheckInputs = [
+    versionCheckHook
+  ];
+  doInstallCheck = true;
+
+  meta = {
+    description = "An interactive visualisation and plotting tool using kernel interpolation, mainly used for Smoothed Particle Hydrodynamics simulations";
+    inherit (finalAttrs.src.meta) homepage;
+    license = lib.licenses.lgpl3Plus;
+    maintainers = with lib.maintainers; [ doronbehar ];
+    platforms = lib.platforms.all;
+  };
+})