diff --git a/README.md b/README.md
index 469f8f9..103fe33 100644
--- a/README.md
+++ b/README.md
@@ -229,6 +229,7 @@ for transferring data with URLs.
:small_orange_diamond: Ping.eu - online Ping, Traceroute, DNS lookup, WHOIS and others.
:small_orange_diamond: Network-Tools - network tools for webmasters, IT technicians & geeks.
:small_orange_diamond: URL Encode/Decode - tool from above to either encode or decode a string of text.
+ :small_orange_diamond: XSS String Encoder - for generating XSS code to check your input validation filters against XSS.
:small_orange_diamond: RegExr - online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
:small_orange_diamond: Hardenize - deploy the security standards.
+ :small_orange_diamond: Feedly - organize, read and share what matters to you.
+
+ :small_orange_diamond: 0day.today - exploits market provides you the possibility to buy zero-day exploits and also to sell 0day exploits.
+ :small_orange_diamond: Exploit-DB - the exploit database: exploits, shellcode, 0days, remote exploits, local exploits, web Apps and more.
+ :small_orange_diamond: publiclyDisclosed - unofficial HackerOne public disclosure watcher who keeps you up to date about the recently disclosed bugs.
+ :small_orange_diamond: Sekurak - about security, penetration tests, vulnerabilities and many others (PL/EN).
+ :small_orange_diamond: nf.sec - basic aspects and mechanisms of Linux operating system securit (PL).
+