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+After using this armature, to export from Blender, make sure your armature and all its meshes are oriented to face +Y. Apply all transformations in Object mode. Check it a couple of times - parented objects sometimes follot the Object > Apply and sometimes don't, and I haven't figured out the right workflow.
+
+Then put the armature into edit mode, select all, clear bone roll.
+
+Make sure your mesh is clean. Problems here can cause viewer import failures. There may be more that's needed on this list; these are the ones I know about:  
+In the properties editor, 
+Object properties:
+Relations: make sure your mesh is parented to the right armature
+Delete Custom Properties, if any (if your mesh came from other software or used plugins, there might be junk there)
+
+Modifiers
+Make sure there is only one Armature modifier, and that it's pointing to the right armature
+
+Object Data Properties
+Delete unused vertex groups
+Max deform bone vertex groups per mesh: 110
+Geometry: Clear data - sculpt mask, custom split normals, etc.
+
+Material properties:
+Delete unused materials from each mesh
+Rename materials: no spaces nor special characters. 
+Make sure all verts in the mesh are assigned to a material
+If you made LOD or physics versions, each one must have the same material as the high LOD or physics version. 
+No more than 8 materials per mesh
+No more than 21844 tris per material
+
+
+Then Export - Collada, with the following selections in the export options (Gear icon):
+
+Operator Preset: SL+Open Sim rigged 
+and make sure these checkboxes are ticked:
+Main tab
+Selection Only
+Include Armatures
+Global Orientation Apply
+Forward Axis Y
+Up Axis Z
+Texture options
+Copy
+UV, only selected
+
+Geom tab
+Triangulate 
+Apply modifiers Viewport
+Transform Matrix
+
+Armature tab
+Deform Bones Only
+Export to SL/Open Sim
+
+Anim tab
+Include Animations (I don't know what this does)
+
+Extras
+Use Blender Profile
+Sort by Object Name
+If you edited the armature, for example for a tiny or non-human, then:
+Keep Bind Info
+
+
+Import:
+Include skin weight
+
+If your armature is resized (giants and tinies) or non-human: Include joint positions
+