removed duplicate exploit-db; moved explain-shell to playgrounds

README.md

@@ -277,6 +277,7 @@ for transferring data with URLs.<br>
 
 <p>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.shellcheck.net/"><b>ShellCheck</b></a> - finds bugs in your shell scripts.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://explainshell.com/"><b>explainshell</b></a> - get interactive help texts for shell commands.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://jsbin.com/?html,output"><b>jsbin</b></a> - live pastebin for HTML, CSS & JavaScript and more.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="http://sandbox.onlinephpfunctions.com/"><b>PHP Sandbox</b></a> - test your PHP code with this code tester.<br>
 </p>
@@ -313,7 +314,6 @@ performance of any of your sites from across the globe.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dylanaraps/pure-bash-bible"><b>pure-bash-bible</b></a> - a collection of pure bash alternatives to external processes.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="http://wiki.bash-hackers.org/start"><b>The Bash Hackers Wiki</b></a> - hold documentation of any kind about GNU Bash.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/contents.html"><b>Shell & Utilities</b></a> - describes the commands and utilities offered to application programs by POSIX-conformant systems.<br>
-&nbsp;&nbsp;:small_orange_diamond: <a href="https://explainshell.com/"><b>Explain shell</b></a> - get interactive help texts for shell commands.<br>
 </p>
 
 ##### :black_small_square: Programming
@@ -533,7 +533,6 @@ Linux Security Expert</b></a> - trainings, howtos, checklists, security tools an
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.darkreading.com/"><b>DARKReading</b></a> - connecting the Information Security Community.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://twitter.com/disclosedh1"><b>publiclyDisclosed</b></a> - public disclosure watcher who keeps you up to date about the recently disclosed bugs.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://0day.today/"><b>0day.today</b></a> - exploits market provides you the possibility to buy zero-day exploits and also to sell 0day exploits.<br>
-&nbsp;&nbsp;:small_orange_diamond: <a href="https://www.exploit-db.com/"><b>Exploit-DB</b></a> - the exploit database: exploits, shellcode, 0days, remote exploits, local exploits, web Apps and more.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://sploitus.com/"><b>sploitus</b></a> - the exploit and tools database.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://packetstormsecurity.com/"><b>Packet Storm</b></a> - information security services, news, files, tools, exploits, aAdvisories and whitepapers.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://sekurak.pl/"><b>Sekurak</b></a> - about security, penetration tests, vulnerabilities and many others (PL/EN).<br>