Example for downloading and running from the command line on Mac:
curl -L -O 'https://github.com/KhronosGroup/glTF/releases/download/v1.0-draft/collada2gltf_mac_v1.0-draft_x64.gz'
gunzip collada2gltf_mac_v1.0-draft_x64.gz
mv collada2gltf_mac_v1.0-draft_x64 collada2gltf
chmod +x collada2gltf
./collada2gltf