diff --git a/regexes.yaml b/regexes.yaml
index 21e2ae1a..d415c26a 100644
--- a/regexes.yaml
+++ b/regexes.yaml
@@ -88,7 +88,7 @@ user_agent_parsers:
   - regex: '(DAVdroid)/(\d+)\.(\d+)(?:\.(\d+)|)'
 
   # Downloader ...
-  - regex: '(Google-HTTP-Java-Client|Apache-HttpClient|Go-http-client|scalaj-http|http%20client|Python-urllib|HttpMonitor|TLSProber|WinHTTP|JNLP|okhttp|aihttp|reqwest)(?:[ /](\d+)(?:\.(\d+)|)(?:\.(\d+)|)|)'
+  - regex: '(Google-HTTP-Java-Client|Apache-HttpClient|Go-http-client|scalaj-http|http%20client|Python-urllib|HttpMonitor|TLSProber|WinHTTP|JNLP|okhttp|aihttp|reqwest|axios|unirest-(?:java|python|ruby|nodejs|php|net))(?:[ /](\d+)(?:\.(\d+)|)(?:\.(\d+)|)|)'
 
   # Pinterestbot
   - regex: '(Pinterest(?:bot|))/(\d+)(?:\.(\d+)|)(?:\.(\d+)|)[;\s(]+\+https://www.pinterest.com/bot.html'
@@ -99,7 +99,7 @@ user_agent_parsers:
 
   # AWS S3 Clients
   # must come before "Bots General matcher" to catch "boto"/"boto3" before "bot"
-  - regex: '\b(Boto3?|JetS3t|aws-(?:cli|sdk-(?:cpp|go|java|nodejs|ruby2?))|s3fs)/(\d+)\.(\d+)(?:\.(\d+)|)'
+  - regex: '\b(Boto3?|JetS3t|aws-(?:cli|sdk-(?:cpp|go|java|nodejs|ruby2?|dotnet-(?:\d{1,2}|core)))|s3fs)/(\d+)\.(\d+)(?:\.(\d+)|)'
 
   # Facebook
   # Must come before "Bots General matcher" to catch OrangeBotswana
@@ -810,13 +810,23 @@ user_agent_parsers:
     family_replacement: 'Python Requests'
 
   # headless user-agents
-  - regex: '\b(Windows-Update-Agent|Microsoft-CryptoAPI|SophosUpdateManager|SophosAgent|Debian APT-HTTP|Ubuntu APT-HTTP|libcurl-agent|libwww-perl|urlgrabber|curl|PycURL|Wget|aria2|Axel|OpenBSD ftp|lftp|jupdate|insomnia)(?:[ /](\d+)(?:\.(\d+)|)(?:\.(\d+)|)|)'
+  - regex: '\b(Windows-Update-Agent|Microsoft-CryptoAPI|SophosUpdateManager|SophosAgent|Debian APT-HTTP|Ubuntu APT-HTTP|libcurl-agent|libwww-perl|urlgrabber|curl|PycURL|Wget|aria2|Axel|OpenBSD ftp|lftp|jupdate|insomnia|fetch libfetch|akka-http|got)(?:[ /](\d+)(?:\.(\d+)|)(?:\.(\d+)|)|)'
+
+  # Asynchronous HTTP Client/Server for asyncio and Python (https://aiohttp.readthedocs.io/)
+  - regex: '(Python/3\.\d{1,3} aiohttp)/(\d+)\.(\d+)\.(\d+)'
+  # Asynchronous HTTP Client/Server for asyncio and Python (https://aiohttp.readthedocs.io/)
+  - regex: '(Python/3\.\d{1,3} aiohttp)/(\d+)\.(\d+)\.(\d+)'
 
   - regex: '(Java)[/ ]{0,1}\d+\.(\d+)\.(\d+)[_-]*([a-zA-Z0-9]+|)'
 
   # Cloud Storage Clients
   - regex: '^(Cyberduck)/(\d+)\.(\d+)\.(\d+)(?:\.\d+|)'
   - regex: '^(S3 Browser) (\d+)-(\d+)-(\d+)(?:\s*http://s3browser\.com|)'
+  - regex: '(S3Gof3r)'
+  # IBM COS (Cloud Object Storage) API
+  - regex: '\b(ibm-cos-sdk-(?:core|java|js|python))/(\d+)\.(\d+)(?:\.(\d+)|)'
+  # rusoto - Rusoto - AWS SDK for Rust - https://github.com/rusoto/rusoto
+  - regex: '^(rusoto)/(\d+)\.(\d+)\.(\d+)'
   # rclone - rsync for cloud storage - https://rclone.org/
   - regex: '^(rclone)/v(\d+)\.(\d+)'
 
@@ -1493,6 +1503,8 @@ os_parsers:
     os_replacement: 'Red Hat'
   - regex: '\((freebsd)(\d+)\.(\d+)\)'
     os_replacement: 'FreeBSD'
+  - regex: 'linux'
+    os_replacement: 'Linux'
 
   # Roku Digital-Video-Players https://www.roku.com/
   - regex: '^(Roku)/DVP-(\d+)\.(\d+)'
diff --git a/test_resources/pgts_browser_list.yaml b/test_resources/pgts_browser_list.yaml
index c0532e0f..6cc41c2a 100755
--- a/test_resources/pgts_browser_list.yaml
+++ b/test_resources/pgts_browser_list.yaml
@@ -4159,9 +4159,9 @@ test_cases:
     patch:
 
   - user_agent_string: 'fetch libfetch/2.0'
-    family: 'Other'
-    major:
-    minor:
+    family: 'fetch libfetch'
+    major: '2'
+    minor: '0'
     patch:
 
   - user_agent_string: 'libwww-perl/5.79'
diff --git a/tests/test_os.yaml b/tests/test_os.yaml
index f0aa5f91..e088f28e 100644
--- a/tests/test_os.yaml
+++ b/tests/test_os.yaml
@@ -2700,6 +2700,27 @@ test_cases:
     patch:
     patch_minor:
 
+  - user_agent_string: 'ibm-cos-sdk-java/2.3.0 Linux/4.9.0-8-amd64 Java_HotSpot(TM)_64-Bit_Server_VM/9.0.4+11/9.0.4'
+    family: 'Linux'
+    major: '4'
+    minor: '9'
+    patch: '0'
+    patch_minor:
+
+  - user_agent_string: 'aws-sdk-dotnet-45/3.3.11.0 aws-sdk-dotnet-core/3.3.17.10 .NET_Runtime/4.0 .NET_Framework/4.0 OS/Microsoft_Windows_NT_6.2.9200.0 ClientSync'
+    family: 'Windows'
+    major:
+    minor:
+    patch:
+    patch_minor:
+
+  - user_agent_string: 'rusoto/0.36.0 rust/1.35.0 linux'
+    family: 'Linux'
+    major:
+    minor:
+    patch:
+    patch_minor:
+
   - user_agent_string: 'SalesforceMobileSDK/5.3.0 android mobile/8.0.0 (SM-G955F) Salesforce1/15.2 Native uid_c4589f605fad8c7e ftr_ Cordova/6.2.3'
     family: 'Android'
     major: '8'
diff --git a/tests/test_ua.yaml b/tests/test_ua.yaml
index 27b7859c..b91e732c 100644
--- a/tests/test_ua.yaml
+++ b/tests/test_ua.yaml
@@ -7664,6 +7664,61 @@ test_cases:
     minor: '8'
     patch: '1'
 
+  - user_agent_string: 'akka-http/10.0.10'
+    family: 'akka-http'
+    major: '10'
+    minor: '0'
+    patch: '10'
+
+  - user_agent_string: 'Python/3.6 aiohttp/3.5.4'
+    family: 'Python/3.6 aiohttp'
+    major: '3'
+    minor: '5'
+    patch: '4'
+
+  - user_agent_string: 'unirest-java/1.3.11'
+    family: 'unirest-java'
+    major: '1'
+    minor: '3'
+    patch: '11'
+
+  - user_agent_string: 'axios/0.18.0'
+    family: 'axios'
+    major: '0'
+    minor: '18'
+    patch: '0'
+
+  - user_agent_string: 'got/9.6.0 (https://github.com/sindresorhus/got)'
+    family: 'got'
+    major: '9'
+    minor: '6'
+    patch: '0'
+
+  - user_agent_string: 'S3Gof3r'
+    family: 'S3Gof3r'
+    major:
+    minor:
+    patch:
+
+  - user_agent_string: 'rusoto/0.36.0 rust/1.35.0 linux'
+    family: 'rusoto'
+    major: '0'
+    minor: '36'
+    patch: '0'
+
+  - user_agent_string: 'ibm-cos-sdk-java/2.3.0 Linux/4.9.0-8-amd64 Java_HotSpot(TM)_64-Bit_Server_VM/9.0.4+11/9.0.4'
+    family: 'ibm-cos-sdk-java'
+    major: '2'
+    minor: '3'
+    patch: '0'
+
+  - user_agent_string: 'aws-sdk-dotnet-45/3.3.11.0 aws-sdk-dotnet-core/3.3.17.10 .NET_Runtime/4.0 .NET_Framework/4.0 OS/Microsoft_Windows_NT_6.2.9200.0 ClientSync'
+    family: 'aws-sdk-dotnet-45'
+    major: '3'
+    minor: '3'
+    patch: '11'
+    patch_minor: '0'
+
   - user_agent_string: 'Boto/2.48.0 Python/2.7.14 Linux/4.2.0-41-generic'
     family: 'Boto'
     major: '2'