diff --git a/404.html b/404.html
index 888cd5afa..00e4842bd 100644
--- a/404.html
+++ b/404.html
@@ -9,5 +9,9 @@
 <div class="gcse-search">
 </div>
 <div style="position: relative; padding-bottom: 100%; height: 0; overflow: hidden;">
+  <iframe name="embed_readwrite" src="https://pad.riseup.net/p/short-ref-keep?showControls=true&showChat=true&showLineNumbers=true&useMonospaceFont=false" width="100%" height="600" frameborder="0"></iframe>
+  <iframe src="https://docs.google.com/document/d/e/2PACX-1vTBvs4WB2dnvzzkxyit5hH-ITL5AyF6TwcL381zi5bO1fVqnMRaw3lEqL3MroompulTcmiJroWskop9/pub?embedded=true"></iframe>
   <iframe src="https://cryptpad.disroot.org/pad/#/2/pad/edit/up6JToZndwtvZLJyPBd4Jwyy/embed/" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;" frameborder="0"></iframe>
+  <iframe name="embed_readwrite" src="https://etherpad.mit.edu/p/v6b8S5e7lS?showControls=true&showChat=true&showLineNumbers=true&useMonospaceFont=false" width=600 height=400></iframe>
+  <iframe name="embed_readwrite" src="https://etherpad.opendev.org/p/Spu46RnAyh7mkoX0fTIu?showControls=true&showChat=true&showLineNumbers=true&useMonospaceFont=false" width="100%" height="600" frameborder="0"></iframe>
 </div>