diff --git a/app-bureautique.nix b/app-bureautique.nix
new file mode 100644
index 0000000..4e76fe2
--- /dev/null
+++ b/app-bureautique.nix
@@ -0,0 +1,23 @@
+{ config, libs, pkgs, ... }:
+
+{
+  imports = [
+  ];
+
+  environment.systemPackages = with pkgs; [
+    # Bureautique
+    aspell
+    dia
+    freemind
+    gnumeric
+    graphviz
+    kde5.okular
+    lyx
+    mcomix
+    pandoc
+    pdfpc
+    qpdfview
+    texLiveFull
+    zim
+  ];
+}
diff --git a/app-cao.nix b/app-cao.nix
new file mode 100644
index 0000000..385d7b4
--- /dev/null
+++ b/app-cao.nix
@@ -0,0 +1,14 @@
+{ config, libs, pkgs, ... }:
+
+{
+  imports = [
+  ];
+
+  environment.systemPackages = with pkgs; [
+    # CAO
+    freecad
+    fritzing
+    kicad
+    qucs
+  ];
+}
diff --git a/app-client-internet.nix b/app-client-internet.nix
new file mode 100644
index 0000000..6c7ac55
--- /dev/null
+++ b/app-client-internet.nix
@@ -0,0 +1,20 @@
+{ config, libs, pkgs, ... }:
+
+{
+  imports = [
+  ];
+
+  environment.systemPackages = with pkgs; [
+    # Clients Internet
+    chromium
+    clawsMail
+    firefox
+    kde5.quasselClient
+    mutt
+    mumble
+    pidgin
+    python27Packages.turses
+    thunderbird
+  ];
+}
+
diff --git a/app-dev.nix b/app-dev.nix
new file mode 100644
index 0000000..1f589df
--- /dev/null
+++ b/app-dev.nix
@@ -0,0 +1,20 @@
+{ config, libs, pkgs, ... }:
+
+{
+  imports = [
+  ];
+
+  environment.systemPackages = with pkgs; [
+    # Développement
+    cargo
+    cloc
+    ghc
+    git-cola
+    idea.idea-community
+    mercurial
+    meld
+    rustPlatform.rustc
+    stack
+    subversion
+  ];
+}
diff --git a/app-multimedia.nix b/app-multimedia.nix
new file mode 100644
index 0000000..00d2879
--- /dev/null
+++ b/app-multimedia.nix
@@ -0,0 +1,23 @@
+{ config, libs, pkgs, ... }:
+
+{
+  imports = [
+  ];
+
+  environment.systemPackages = with pkgs; [
+    # Multimedia
+    audacity
+    beep
+    cmus
+    easytag
+    kde4.digikam
+    gimp
+    inkscape
+    paprefs
+    pavucontrol
+    picard
+    smplayer
+    vlc
+    vorbis-tools
+  ];
+}
diff --git a/app-network.nix b/app-network.nix
new file mode 100644
index 0000000..524c0e5
--- /dev/null
+++ b/app-network.nix
@@ -0,0 +1,20 @@
+{ config, libs, pkgs, ... }:
+
+{
+  imports = [
+  ];
+
+  environment.systemPackages = with pkgs; [
+    # network toolbox
+    arp-scan
+    iperf
+    iptraf-ng
+    nload
+    openvpn
+    quagga
+    telnet
+    tinc
+    whois
+    wireshark
+  ];
+}
diff --git a/desktop.nix b/desktop.nix
index fd4e684..14d1c92 100644
--- a/desktop.nix
+++ b/desktop.nix
@@ -2,80 +2,15 @@
 
 {
   imports = [
+    ./app-bureautique.nix
+    ./app-cao.nix
+    ./app-client-internet.nix
+    ./app-dev.nix
+    ./app-multimedia.nix
+    ./app-network.nix
   ];
 
   environment.systemPackages = with pkgs; [
-    # network toolbox
-    arp-scan
-    iperf
-    iptraf-ng
-    nload
-    openvpn
-    quagga
-    telnet
-    tinc
-    whois
-    wireshark
-
-    # Multimedia
-    audacity
-    beep
-    cmus
-    easytag
-    kde4.digikam
-    gimp
-    inkscape
-    paprefs
-    pavucontrol
-    picard
-    smplayer
-    vlc
-    vorbis-tools
-
-    # Clients Internet
-    chromium
-    clawsMail
-    firefox
-    kde5.quasselClient
-    mutt
-    mumble
-    pidgin
-    python27Packages.turses
-    thunderbird
-
-    # Bureautique
-    aspell
-    dia
-    freemind
-    gnumeric
-    graphviz
-    kde5.okular
-    lyx
-    mcomix
-    pandoc
-    pdfpc
-    qpdfview
-    texLiveFull
-    zim
-
-    # Développement
-    cargo
-    cloc
-    ghc
-    git-cola
-    idea.idea-community
-    mercurial
-    meld
-    rustPlatform.rustc
-    stack
-    subversion
-
-    # CAO
-    freecad
-    fritzing
-    kicad
-    qucs
-
     cowsay
     curlftpfs
     docker