diff --git a/share/apps.json b/share/apps.json
index 48157e176..326e85240 100644
--- a/share/apps.json
+++ b/share/apps.json
@@ -1255,6 +1255,11 @@
 			"headers": { "Set-Cookie": "lep\\d+sessionid=" },
 			"implies": "PHP"
 		},
+		"LESS": {
+			"website": "lesscss.org",
+			"cats": [ 19 ],
+			"html": "<link[^>]+ rel=\"stylesheet/less\""
+		},
 		"Liferay": {
 			"website": "www.liferay.com",
 			"cats": [ 1 ],
@@ -1818,6 +1823,12 @@
 			"cats": [ 6 ],
 			"html": "s\\d\\d\\.php\\?shopid=\\1"
 		},
+		"Prefix-Free": {
+			"website": "http://leaverou.github.io/prefixfree/",
+			"cats": [ 19 ],
+			"script": "prefixfree\\.js",
+			"env": "^PrefixFree$"
+		},
 		"Prestashop": {
 			"website": "www.prestashop.com",
 			"cats": [ 6 ],
diff --git a/share/images/icons/Less.png b/share/images/icons/Less.png
new file mode 100644
index 000000000..9e1de2359
Binary files /dev/null and b/share/images/icons/Less.png differ
diff --git a/share/images/icons/Prefix-Free.png b/share/images/icons/Prefix-Free.png
new file mode 100644
index 000000000..87a646815
Binary files /dev/null and b/share/images/icons/Prefix-Free.png differ