Implemented @rocky's suggestions

Author: GarkGarcia

index.html

@@ -224,7 +224,7 @@ <h2>Documentation</h2>
         </div>
       </section>
 
-    <!-- Documentation -->
+    <!-- Support -->
 			<section id="support" class="wrapper style2 special">
         <h2>Support</h2>
 				<div class="inner align-left">
@@ -243,13 +243,48 @@ <h2>Support</h2>
 
 						<li>
 							<a href="https://github.com/mathics/">
-                Github mathics Organization
+                GitHub mathics Organization
               </a>
 						</li>
 					</ul>
         </div>
       </section>
 
+    <!-- Contributing -->
+			<section id="contributing" class="wrapper style2 special">
+        <h2>Contributing</h2>
+				<div class="inner align-left">
+          <p>
+            Please checkout our contributing guide at 
+            <a href="https://mathics-development-guide.readthedocs.io/en/latest/developing-code/contributing-developing.html">
+            mathics-development-guide.readthedocs.io/en/latest/developing-code/contributing-developing
+            </a>. <strong>Developers wanted! Please get in touch if you want 
+            to be part of this awesome project.</strong>
+          </p>
+        </div>
+      </section>
+
+    <!-- On the Shoulders of Giants -->
+			<section id="on_the_shoulders_of_giants" class="wrapper style2 special">
+        <h2>On the Shoulders of Giants</h2>
+				<div class="inner align-left">
+          <p>
+            This project is only possible due the work of countless volunteers,
+            which includes people who worked on software used internally by
+            Mathics such as:
+          </p>
+
+          <ul>
+            <li><a href="https://www.sympy.org/en/index.html">SymPy</a></li>
+            <li><a href="https://mpmath.org/doc/current/">mpmath</a></li>
+            <li><a href="https://github.com/numba/llvmlite">llvmlite</a></li>
+            <li><a href="https://www.djangoproject.com/">Django</a></li>
+            <li><a href="https://www.mathjax.org/">MathJax</a></li>
+            <li><a href="https://asymptote.sourceforge.io/">Asymptote</a></li>
+          </ul>
+        </div>
+      </section>
+
 		<!-- Screenshots -->
 			<section id="screenshots" class="wrapper style2 special">
 				<header class="inner major">