diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..c9dc8c6
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+caqui
\ No newline at end of file
diff --git a/source_code/6-async-crawler.py b/source_code/6-async-crawler.py
new file mode 100644
index 0000000..cb19f79
--- /dev/null
+++ b/source_code/6-async-crawler.py
@@ -0,0 +1,95 @@
+# This script opens MAX_CONCURRENCY (3) paralell browsers, accesses a
+# different URL on each one, gets all links from each page e prints the number of links
+#
+## ATENTION: Before run the script, start the driver as a server ###
+## more details in https://github.com/douglasdcm/caqui
+#
+# $ ./chromedriver --port=9999
+#
+## Open another terminal to run the script
+#
+# $ python 6-async-crawler.py
+#
+# output >
+# Link found '127' links in https://pypi.org/project/caqui/
+# Link found '207' links in https://www.selenium.dev/documentation/
+# Link found '611' links in https://pt.wikipedia.org/wiki/Wikip%C3%A9dia:P%C3%A1gina_principal
+# Link found '64' links in https://docs.python.org/3/library/asyncio.html
+# Link found '189' links in https://github.com/DwarfThief/Raspagem-de-dados-para-iniciantes
+# Link found '9695' links in https://www.w3.org/TR/webdriver/
+# Link found '191' links in https://www.vagas.com.br/
+# Link found '235' links in https://www.youtube.com/
+# Link found '15' links in https://testautomationu.applitools.com/
+# Link found '72' links in http://appium.io/docs/en/2.0/
+# Link found '201' links in https://github.com/microsoft/WinAppDriver
+# Link found '347' links in https://www.baixelivros.com.br/
+# Link found '312' links in https://www.estantevirtual.com.br/
+# Time: 18.40 sec
+
+import asyncio
+import time
+from os import getcwd
+from caqui.easy import AsyncDriver  # Asynchonous driver, similar to Selenium/Arsenic
+from caqui.by import By
+
+URLS = [
+    "https://pypi.org/project/caqui/",
+    "https://pt.wikipedia.org/wiki/Wikip%C3%A9dia:P%C3%A1gina_principal",
+    "https://www.selenium.dev/documentation/",
+    "https://www.w3.org/TR/webdriver/",
+    "https://docs.python.org/3/library/asyncio.html",
+    "https://github.com/DwarfThief/Raspagem-de-dados-para-iniciantes",
+    "https://www.youtube.com/",
+    "https://www.vagas.com.br/",
+    "https://testautomationu.applitools.com/",
+    "http://appium.io/docs/en/2.0/",
+    "https://github.com/microsoft/WinAppDriver",
+    "https://www.estantevirtual.com.br/",
+    "https://www.baixelivros.com.br/",
+]
+
+MAX_CONCURRENCY = 3  # number of webdriver instances running
+all_anchors = []
+semaphore = asyncio.Semaphore(MAX_CONCURRENCY)
+
+
+async def get_links(url):
+    async with semaphore:  # open MAX_CONCURRENCY browsers
+        remote = (
+            "http://127.0.0.1:9999"  # URL of the webdriver that is runnig as a server
+        )
+        capabilities = {  # desired capabilities
+            "desiredCapabilities": {
+                "browserName": "chrome",
+                "acceptInsecureCerts": True,
+                "pageLoadStrategy": "eager",
+                ## Uncomment to run in headless mode
+                # "goog:chromeOptions": {"extensions": [], "args": ["--headless"]},
+            }
+        }
+
+        driver = AsyncDriver(remote, capabilities)
+
+        await driver.get(url)  # open the page
+        links = await driver.find_elements(By.XPATH, "//a")  # find all links
+
+        print(f"Link found '{len(links)}' links in {url}")
+
+        driver.quit()
+
+
+async def main():
+    tasks = [asyncio.ensure_future(get_links(url)) for url in URLS]  # create the tasks
+    await asyncio.gather(*tasks)  # run all tasks in parallel according to Semaphore
+
+
+if __name__ == "__main__":
+    start = time.time()
+    loop = asyncio.get_event_loop()
+    try:
+        loop.run_until_complete(main())
+    finally:
+        loop.run_until_complete(loop.shutdown_asyncgens())
+        loop.close()
+        end = time.time()
+        print(f"Time: {end-start:.2f} sec")