Tor == "The Onion Router".

TorGuard == something completely unrelated to Tor. Per the TorGuard website (https://torguard.net/faq.php):

"Is TorGuard related in any way to the “tor” project? No, The reference to "tor" in TorGuard relates to "torrents" and guarding one’s privacy when using bitorrent. We are not related in any way to the “tor” project however the company does support through donations."

Orbot, OTOH, is part of the Tor Project (https://www.torproject.org/docs/android.html.en) and Globus (https://play.google.com/store/apps/details?id=com.globus.vpn...) claims to support Tor.