diff --git a/Casks/b/bitcoin-core.rb b/Casks/b/bitcoin-core.rb
index c464e7f2a0..bba377b319 100644
--- a/Casks/b/bitcoin-core.rb
+++ b/Casks/b/bitcoin-core.rb
@@ -11,8 +11,8 @@ cask "bitcoin-core" do
   homepage "https://bitcoincore.org/"
 
   livecheck do
-    url "https://github.com/bitcoin/bitcoin"
-    strategy :github_latest
+    url "https://bitcoincore.org/en/download/"
+    regex(/href=.*?bitcoin[._-]v?(\d+(?:\.\d+)+)[._-]#{arch}[^"' >]*?\.dmg/i)
   end
 
   depends_on macos: ">= :catalina"
diff --git a/Casks/c/calibre.rb b/Casks/c/calibre.rb
index 52d70de9d1..023fa05c46 100644
--- a/Casks/c/calibre.rb
+++ b/Casks/c/calibre.rb
@@ -44,8 +44,8 @@ cask "calibre" do
     sha256 "884061bce0df80085b4a9ce60da1f63530040f615804eb8cf499718a2e314a8e"
 
     livecheck do
-      url "https://github.com/kovidgoyal/calibre"
-      strategy :github_latest
+      url "https://calibre-ebook.com/dist/osx"
+      strategy :header_match
     end
   end
 
diff --git a/Casks/l/litecoin.rb b/Casks/l/litecoin.rb
index f48d3e0176..50c9d20f6e 100644
--- a/Casks/l/litecoin.rb
+++ b/Casks/l/litecoin.rb
@@ -8,8 +8,8 @@ cask "litecoin" do
   homepage "https://litecoin.org/"
 
   livecheck do
-    url "https://github.com/litecoin-project/litecoin"
-    strategy :github_latest
+    url :homepage
+    regex(/href=.*?litecoin[._-]v?(\d+(?:\.\d+)+)[^"' >]*?\.dmg/i)
   end
 
   app "Litecoin-Qt.app"
diff --git a/Casks/m/mudlet.rb b/Casks/m/mudlet.rb
index a85010a793..deb6e2b531 100644
--- a/Casks/m/mudlet.rb
+++ b/Casks/m/mudlet.rb
@@ -8,7 +8,8 @@ cask "mudlet" do
   homepage "https://www.mudlet.org/"
 
   livecheck do
-    url "https://github.com/Mudlet/Mudlet"
+    url "https://www.mudlet.org/download/"
+    regex(/href=.*?Mudlet[._-]v?(\d+(?:\.\d+)+)\.dmg/i)
   end
 
   depends_on macos: ">= :high_sierra"
diff --git a/Casks/n/nwjs.rb b/Casks/n/nwjs.rb
index 3c1076cf38..8eda34224d 100644
--- a/Casks/n/nwjs.rb
+++ b/Casks/n/nwjs.rb
@@ -10,9 +10,17 @@ cask "nwjs" do
   desc "Call all Node.js modules directly from the DOM and Web Workers"
   homepage "https://nwjs.io/"
 
+  # The upstream download page appends a UNIX epoch timestamp (in milliseconds)
+  # to the JSON URL, so we do the same (in case it affects the returned data).
   livecheck do
-    url "https://github.com/nwjs/nw.js"
-    regex(/^nw[._-]v?(\d+(?:\.\d+)+)$/i)
+    url "https://nwjs.io/versions.json?#{DateTime.now.strftime("%Q")}"
+    regex(/^v?(\d+(?:\.\d+)+)$/i)
+    strategy :json do |json, regex|
+      match = json["stable"]&.match(regex)
+      next if match.blank?
+
+      match[1]
+    end
   end
 
   app "nwjs-sdk-v#{version}-osx-#{arch}/nwjs.app"
diff --git a/Casks/q/qlc-plus.rb b/Casks/q/qlc-plus.rb
index b4e4d92c2c..96c6417fae 100644
--- a/Casks/q/qlc-plus.rb
+++ b/Casks/q/qlc-plus.rb
@@ -8,8 +8,8 @@ cask "qlc-plus" do
   homepage "https://qlcplus.org/"
 
   livecheck do
-    url "https://github.com/mcallegari/qlcplus"
-    regex(/^QLC\+[._-]v?(\d+(?:\.\d+)+)$/i)
+    url "https://qlcplus.org/download"
+    regex(/href=.*?QLC\+[._-]v?(\d+(?:\.\d+)+)\.dmg/i)
   end
 
   app "QLC+.app"
diff --git a/Casks/t/tigervnc-viewer.rb b/Casks/t/tigervnc-viewer.rb
index 347a645983..bf67e2dfaf 100644
--- a/Casks/t/tigervnc-viewer.rb
+++ b/Casks/t/tigervnc-viewer.rb
@@ -9,8 +9,8 @@ cask "tigervnc-viewer" do
   homepage "https://tigervnc.org/"
 
   livecheck do
-    url "https://github.com/TigerVNC/tigervnc"
-    strategy :github_latest
+    url "https://sourceforge.net/projects/tigervnc/rss?path=/stable"
+    regex(%r{url=.*?/TigerVNC[._-]v?(\d+(?:\.\d+)+)\.dmg}i)
   end
 
   app "TigerVNC Viewer #{version}.app"
diff --git a/Casks/t/todour.rb b/Casks/t/todour.rb
index 90f24cf7cb..bbaf59b53a 100644
--- a/Casks/t/todour.rb
+++ b/Casks/t/todour.rb
@@ -8,8 +8,8 @@ cask "todour" do
   homepage "https://nerdur.com/todour-pl/"
 
   livecheck do
-    url "https://github.com/SverrirValgeirsson/Todour"
-    strategy :github_latest
+    url :homepage
+    regex(/href=.*?Todour[._-]v?(\d+(?:\.\d+)+)\.dmg/i)
   end
 
   app "Todour.app"
diff --git a/Casks/v/vagrant.rb b/Casks/v/vagrant.rb
index 8534bcce67..b03c0a49aa 100644
--- a/Casks/v/vagrant.rb
+++ b/Casks/v/vagrant.rb
@@ -12,8 +12,8 @@ cask "vagrant" do
   homepage "https://www.vagrantup.com/"
 
   livecheck do
-    url "https://github.com/hashicorp/vagrant"
-    strategy :github_latest
+    url "https://developer.hashicorp.com/vagrant/install"
+    regex(/href=[^ >]*?vagrant[._-]v?(\d+(?:\.\d+)+)(?:[._-]darwin)?(?:[._-]#{arch})?\.dmg/i)
   end
 
   pkg "vagrant.pkg"
diff --git a/Casks/z/zerotier-one.rb b/Casks/z/zerotier-one.rb
index 9c27b308e7..9aa4de285f 100644
--- a/Casks/z/zerotier-one.rb
+++ b/Casks/z/zerotier-one.rb
@@ -5,11 +5,11 @@ cask "zerotier-one" do
   url "https://download.zerotier.com/RELEASES/#{version}/dist/ZeroTier%20One.pkg"
   name "ZeroTier One"
   desc "Mesh VPN client"
-  homepage "https://www.zerotier.com/download.shtml"
+  homepage "https://www.zerotier.com/"
 
   livecheck do
-    url "https://github.com/zerotier/ZeroTierOne"
-    strategy :github_latest
+    url "https://www.zerotier.com/download/"
+    regex(/Latest\s+Version[\s:|]+?v?(\d+(?:\.\d+)+)/i)
   end
 
   depends_on macos: ">= :high_sierra"