diff --git a/modules/darwin/casks.nix b/modules/darwin/casks.nix
index d698655..b4f20f3 100644
--- a/modules/darwin/casks.nix
+++ b/modules/darwin/casks.nix
@@ -30,6 +30,7 @@ _:
   "blackhole-16ch"
   "blackhole-2ch"
   "box-drive"
+  "box-tools"
   "synology-drive"
   "spamsieve"
   "keybase"
@@ -50,6 +51,7 @@ _:
   "spamsieve"
   "libreoffice"
   "macdown"
+  "calibre"
 
   # Browsers
   "google-chrome"
diff --git a/modules/shared/packages.nix b/modules/shared/packages.nix
index 0134be6..c858252 100644
--- a/modules/shared/packages.nix
+++ b/modules/shared/packages.nix
@@ -22,6 +22,7 @@ with pkgs;
   ncdu
   mtr
   nixfmt-rfc-style
+  difftastic
 
   # Encryption and security tools
   age