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 * [Netflix](https://medium.com/netflix-techblog/linux-performance-analysis-in-60-000-milliseconds-accc10403c55) - Linux Performance Analysis in 60,000 Milliseconds
 * [Netflix](https://medium.com/netflix-techblog/netflix-at-velocity-2015-linux-performance-tools-51964ddb81cf) - Netflix at Velocity 2015: Linux Performance Tools (+[Slides](https://www.slideshare.net/brendangregg/velocity-2015-linux-perf-tools))
 * [Aleksandar Todorović](https://github.com/aleksandar-todorovic/awesome-linux) - list of awesome resources that make Linux awesome
+* [Geek Flare](https://geekflare.com/category/web-infrastructure/unix/) - general Unix articles, tips, tools for managing web infrastructure
+* [Chandan Kumar](https://geekflare.com/cheat-sheet-system-admin/) - linux sysadmin cheatsheets
  
 ## Linux for fun
 * [Justin Pot](http://www.makeuseof.com/tag/x-quirky-linux-commands-need-know-will-love/) - 9 Quirky Linux Commands You Need to Know (And Will Love)
@@ -661,6 +663,7 @@ I just want to centralize my findings and bookmarks in a central location, and s
 * [David Mytton](https://blog.serverdensity.com/how-and-why-we-use-devops-checklists/) - How and why we use DevOps checklists
 * [Francisco Augusto](https://github.com/kahun/awesome-sysadmin) - kahun/awesome-sysadmin : A curated list of amazingly awesome open source sysadmin resources
 * [Crack Duck](https://github.com/n1trux/awesome-sysadmin) - n1trux/awesome-sysadmin : (fork of [Francisco Augusto](https://github.com/kahun/awesome-sysadmin))
+* [Chandan Kumar](https://geekflare.com/cheat-sheet-system-admin/) - linux sysadmin cheatsheets
 
 ## Logging
 * [Splunk Plugin for Jenkins](https://wiki.jenkins-ci.org/display/JENKINS/Splunk+Plugin+for+Jenkins)
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 * [Chandan Kumar](https://geekflare.com/ssl-certificate-tools) - 9 free useful online SSL/TLS Certificate Tools
 * [Chandan Kumar](https://geekflare.com/ssl-test-certificate/) - Verify your SSL, TLS & Ciphers implementation.
 * [Chandan Kumar](https://geekflare.com/find-sql-injection/) - Test your website for SQL injection attack
+* [Geek Flare](https://geekflare.com/category/security/) - general security articles, tips & tools
 
 ## GPG
 * [Charles Zachary Lockhart](http://irtfweb.ifa.hawaii.edu/~lockhart/gpg/) - GPG Cheat Sheet
@@ -1084,12 +1088,22 @@ I just want to centralize my findings and bookmarks in a central location, and s
 ## OpenSSL 
 * [LZone](http://lzone.de/cheat-sheet/OpenSSL) - OpenSSL Cheat Sheet
 * [Remy van Elst](https://raymii.org/s/tutorials/Encrypt_and_decrypt_files_to_public_keys_via_the_OpenSSL_Command_Line.html) - Encrypt and decrypt files to public keys via the OpenSSL Command Line
+* [LinuxConfig](https://linuxconfig.org/using-openssl-to-encrypt-messages-and-files-on-linux) - Using OpenSSL to encrypt messages and files on Linux
 * [Tom Dryer](http://tombuntu.com/index.php/2007/12/12/simple-file-encryption-with-openssl/) - Simple File Encryption with OpenSSL
 * [Stack Overflow](https://stackoverflow.com/a/31552829/2309958) - File encryption with OpenSSL and Why you should use GPG instead 
 * [Chandan Kumar](https://geekflare.com/openssl-commands-certificates/) - 21 OpenSSL command examples
 * [Why No Padlock](https://www.whynopadlock.com/) - find out why your web page is treated as insecure
 * [Chandan Kumar](https://geekflare.com/ssl-certificate-tools) - 9 free useful online SSL/TLS Certificate Tools
 * [Chandan Kumar](https://geekflare.com/ssl-test-certificate/) - Verify your SSL, TLS & Ciphers implementation.
+* [SSL Shopper](https://www.sslshopper.com/article-most-common-openssl-commands.html) - The Most Common OpenSSL Commands
+* [SSL Shopper](https://www.sslshopper.com/ssl-converter.html) - tools & commands examples for certificates format conversion
+* [Paul Heinlein](https://www.madboa.com/geek/openssl/) - OpenSSL cookbook / command-line howto
+* [Nick Burch](http://gagravarr.org/writing/openssl-certs/others.shtml) - howtos for installing other people's certificates 
+* [Andrej](https://gist.github.com/4ndrej/4547029) - SSLPoke.java for quick validation of Java SSL configuration 
+* [SSL Shopper](https://www.sslshopper.com/article-most-common-java-keytool-keystore-commands.html) - java keytool keystore cheatsheet
+* [Brusten Philip & Van der Velpen Jan](https://shib.kuleuven.be/docs/ssl_commands.shtml) - a few frequently used SSL commands (openssl, keytool, certutil)
+* [CheapSSLSecurity ](https://cheapsslsecurity.com/blog/various-types-ssl-commands-keytool/) - SSL commands list
+* [DigiCert](https://www.digicert.com/ssl-support/pem-ssl-creation.htm) - .pem SSL creation instructions
 
 ## Web 
 * [Raymond Hill](https://github.com/gorhill/uBlock) - uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean. Replace Ghostery and Adblock by uBlock