diff --git a/diagrams/__init__.py b/diagrams/__init__.py
index 1fb33db7..d491c23a 100644
--- a/diagrams/__init__.py
+++ b/diagrams/__init__.py
@@ -87,6 +87,7 @@ class Diagram:
         graph_attr: dict = {},
         node_attr: dict = {},
         edge_attr: dict = {},
+        preserve_graphviz_file: bool = False
     ):
         """Diagram represents a global diagrams context.
 
@@ -142,6 +143,7 @@ class Diagram:
         self.dot.edge_attr.update(edge_attr)
 
         self.show = show
+        self.preserve_graphviz_file = preserve_graphviz_file
 
     def __str__(self) -> str:
         return str(self.dot)
@@ -153,7 +155,8 @@ class Diagram:
     def __exit__(self, exc_type, exc_value, traceback):
         self.render()
         # Remove the graphviz file leaving only the image.
-        os.remove(self.filename)
+        if (not self.preserve_graphviz_file):
+            os.remove(self.filename)
         setdiagram(None)
 
     def _repr_png_(self):
@@ -504,7 +507,8 @@ class Edge:
                 self._attrs = o.attrs.copy()
                 result.append(o)
             else:
-                result.append(Edge(o, forward=forward, reverse=reverse, **self._attrs))
+                result.append(
+                    Edge(o, forward=forward, reverse=reverse, **self._attrs))
         return result
 
     def connect(self, other: Union["Node", "Edge", List["Node"]]):
diff --git a/diagrams/programming/language.py b/diagrams/programming/language.py
index 5503c7b6..c7502e77 100644
--- a/diagrams/programming/language.py
+++ b/diagrams/programming/language.py
@@ -16,6 +16,10 @@ class C(_Language):
     _icon = "c.png"
 
 
+class Cobol(_Language):
+    _icon = "cobol.png"
+
+
 class Cpp(_Language):
     _icon = "cpp.png"
 
@@ -36,6 +40,10 @@ class Erlang(_Language):
     _icon = "erlang.png"
 
 
+class Fortran(_Language):
+    _icon = "fortran.png"
+
+
 class Go(_Language):
     _icon = "go.png"
 
@@ -68,6 +76,10 @@ class Php(_Language):
     _icon = "php.png"
 
 
+class Powershell(_Language):
+    _icon = "powershell.png"
+
+
 class Python(_Language):
     _icon = "python.png"
 
diff --git a/docs/nodes/programming.md b/docs/nodes/programming.md
index df813899..027ab933 100644
--- a/docs/nodes/programming.md
+++ b/docs/nodes/programming.md
@@ -54,11 +54,13 @@ Node classes list of programming provider.
 
 - **diagrams.programming.language.Bash**
 - **diagrams.programming.language.C**
+- **diagrams.programming.language.Cobol**
 - **diagrams.programming.language.Cpp**
 - **diagrams.programming.language.Csharp**
 - **diagrams.programming.language.Dart**
 - **diagrams.programming.language.Elixir**
 - **diagrams.programming.language.Erlang**
+- **diagrams.programming.language.Fortran**
 - **diagrams.programming.language.Go**
 - **diagrams.programming.language.Java**
 - **diagrams.programming.language.Javascript**, **JavaScript** (alias)
@@ -67,6 +69,7 @@ Node classes list of programming provider.
 - **diagrams.programming.language.Matlab**
 - **diagrams.programming.language.Nodejs**, **NodeJS** (alias)
 - **diagrams.programming.language.Php**, **PHP** (alias)
+- **diagrams.programming.language.Powershell**
 - **diagrams.programming.language.Python**
 - **diagrams.programming.language.R**
 - **diagrams.programming.language.Ruby**
diff --git a/resources/programming/language/cobol.png b/resources/programming/language/cobol.png
new file mode 100644
index 00000000..57eb7db6
Binary files /dev/null and b/resources/programming/language/cobol.png differ
diff --git a/resources/programming/language/fortran.png b/resources/programming/language/fortran.png
new file mode 100644
index 00000000..4b60b193
Binary files /dev/null and b/resources/programming/language/fortran.png differ
diff --git a/resources/programming/language/powershell.png b/resources/programming/language/powershell.png
new file mode 100644
index 00000000..c5e45148
Binary files /dev/null and b/resources/programming/language/powershell.png differ