Physics Editor exporter for Godot Game Engine. Written by @aombk, re-hosted here. Unzip in C:\Program Files\CodeAndWeb\PhysicsEditor\resources\exporters - https://github.com/godotengine/godot/issues/3405#issuecomment-298074473

exporter.xml

<exporter>

    <!-- identifier of the exporter -->
    <name>1godot.xml</name>

    <!-- name for the dropbox -->
    <displayName>Godot XML Exporter</displayName>

	<!-- description of the exporter -->
    <description>Godot XML Exporter by aombk</description>

    <!-- exporter version -->
    <version>0.1</version>

    <!-- direction of the y axis: up / down -->
    <yAxisDirection>down</yAxisDirection>

    <!-- physics engine to use: box2d, chipmunk -->
    <physicsEngine>box2d</physicsEngine>

    <!-- name of the template file -->
    <template>godot.xml</template>

    <!-- file exension for the data file -->
    <fileExtension>xml</fileExtension>

    <!-- anchor point settings -->
    <anchorPoint>
        <!-- are anchor points supported ? yes/no -->
        <enabled>no</enabled>

        <!-- relative position of the default anchor point -->
        <relX>0.5</relX>
        <relY>0.5</relY>
    </anchorPoint>

    <origin>
        <relX>0.5</relX>
        <relY>0.5</relY>
        <type>fixed</type>
    </origin>
</exporter>

godot.xml

<?xml version="1.0" encoding="UTF-8" ?>
<resource_file type="PackedScene" subresource_count="1" version="2.1" version_name="Godot Engine v2.1.stable.official">
	<main_resource>
		<dictionary name="_bundled" shared="false">
			<string> "conn_count" </string>
			<int> 0 </int>
			<string> "conns" </string>
			<int_array  len="0"> 				 </int_array>
			<string> "editable_instances" </string>
			<array  len="0" shared="false">
			</array>
			<string> "names" </string>
			<string_array  len="5">
				<string> "CollisionPolygon2D" </string>
				<string> "build_mode" </string>
				<string> "polygon" </string>
				<string> "shape_range" </string>
				<string> "trigger" </string>
			</string_array>
			<string> "node_count" </string>
			<int> 1 </int>
			<string> "node_paths" </string>
			<array  len="0" shared="false">
			</array>
			<string> "nodes" </string>
			<int_array  len="15"> 				-1, -1, 0, 0, -1, 4, 1, 0, 2, 1, 3, 2, 4, 3, 0 </int_array>
			<string> "variants" </string>
			<array  len="4" shared="false">
				<int> 0 </int>
				{% for body in bodies %}{% for fixture in body.fixtures %}
				<vector2_array  len="{{fixture.hull|length}}">{% for point in fixture.hull %}{% if not forloop.first %},{% endif %}{{point.x|floatformat:2}},{{point.y|floatformat:2}}{% endfor %}{% endfor %}{% endfor %}</vector2_array>
				<vector2> -1, -1 </vector2>
				<bool> False </bool>
			</array>
			<string> "version" </string>
			<int> 2 </int>
		</dictionary>

	</main_resource>
</resource_file>