diff --git a/data/PDF4QT b/data/PDF4QT
new file mode 100644
index 0000000000..1ac87c98c4
--- /dev/null
+++ b/data/PDF4QT
@@ -0,0 +1 @@
+https://github.com/JakubMelka/PDF4QT
diff --git a/data/PageEdit b/data/PageEdit
new file mode 100644
index 0000000000..70d1278e3a
--- /dev/null
+++ b/data/PageEdit
@@ -0,0 +1 @@
+https://github.com/Sigil-Ebook/PageEdit
diff --git a/data/Sigil b/data/Sigil
new file mode 100644
index 0000000000..beedb2f996
--- /dev/null
+++ b/data/Sigil
@@ -0,0 +1 @@
+https://github.com/Sigil-Ebook/Sigil