diff --git a/diagrams/saas/chat.py b/diagrams/saas/chat.py
index ebdf053..6ee6615 100644
--- a/diagrams/saas/chat.py
+++ b/diagrams/saas/chat.py
@@ -8,10 +8,22 @@ class _Chat(_Saas):
     _icon_dir = "resources/saas/chat"
 
 
+class Mattermost(_Chat):
+    _icon = "mattermost.png"
+
+
+class RocketChat(_Chat):
+    _icon = "rocket-chat.png"
+
+
 class Slack(_Chat):
     _icon = "slack.png"
 
 
+class Teams(_Chat):
+    _icon = "teams.png"
+
+
 class Telegram(_Chat):
     _icon = "telegram.png"
 
diff --git a/docs/nodes/saas.md b/docs/nodes/saas.md
index 607fa09..0ffff41 100644
--- a/docs/nodes/saas.md
+++ b/docs/nodes/saas.md
@@ -22,7 +22,10 @@ Node classes list of saas provider.
 
 ## saas.chat
 
+- **diagrams.saas.chat.Mattermost**
+- **diagrams.saas.chat.RocketChat**
 - **diagrams.saas.chat.Slack**
+- **diagrams.saas.chat.Teams**
 - **diagrams.saas.chat.Telegram**
 
 ## saas.identity
diff --git a/resources/saas/chat/mattermost.png b/resources/saas/chat/mattermost.png
new file mode 100644
index 0000000..a308a64
Binary files /dev/null and b/resources/saas/chat/mattermost.png differ
diff --git a/resources/saas/chat/rocket-chat.png b/resources/saas/chat/rocket-chat.png
new file mode 100644
index 0000000..0d86cd3
Binary files /dev/null and b/resources/saas/chat/rocket-chat.png differ
diff --git a/resources/saas/chat/teams.png b/resources/saas/chat/teams.png
new file mode 100644
index 0000000..1819cbe
Binary files /dev/null and b/resources/saas/chat/teams.png differ