Include references in the documentation to known Parsel CLI tools

Author: Gallaecio

docs/usage.rst

@@ -743,6 +743,23 @@ are more predictable: ``.get()`` always returns a single result,
 ``.getall()`` always returns a list of all extracted results.
 
 
+Command-Line Interface Tools
+============================
+
+There are third-party tools that allow using Parsel from the command line:
+
+-   `Parsel CLI <https://github.com/rmax/parsel-cli>`_ allows applying
+    Parsel selectors to the standard input. For example, you can apply a Parsel
+    selector to the output of cURL_.
+
+-   `parselcli
+    <https://github.com/Granitosaurus/parsel-cli>`_ provides an interactive
+    shell that allows applying Parsel selectors to a remote URL or a local
+    file.
+
+.. _cURL: https://curl.haxx.se/
+
+
 .. _topics-selectors-ref:
 
 API reference