diff --git a/CloudComputing_Lab/modules/ROOT/pages/tech-list.adoc b/CloudComputing_Lab/modules/ROOT/pages/tech-list.adoc
index ed3833b..6de9fbf 100644
--- a/CloudComputing_Lab/modules/ROOT/pages/tech-list.adoc
+++ b/CloudComputing_Lab/modules/ROOT/pages/tech-list.adoc
@@ -293,3 +293,13 @@ https://netflix.github.io/[netflix github^]
 * https://open-cloud-guide.dev/[open-cloud guide^]
 
 
+== Et cetera
+
+* https://en.wikipedia.org/wiki/The_Cathedral_and_the_Bazaar[The Cathedral and the Bazaar^]
+* http://www.catb.org/~esr/writings/cathedral-bazaar/[The Cathedral and the Bazaar - Translations]
+* http://www.catb.org/~esr/faqs/hacker-howto.html[How To Become A Hacker^]
+* https://www.gutenberg.org/[Project Gutenberg^] - >60,000 free eBooks)
+* https://www.openbook.gr[openbooks library^] - >11.458 ελληνικά e-books
+* https://www.gnu.org/doc/other-free-books.en.html#navigation[Free Books from Other Publishers^]
+* https://opensource.com/resources/organizations[Open source organizations^]
+