voip.ms requires setting up SIP credentials and configuring a softphone (or their app). Great for technical users who want maximum control and lowest rates. Voklit is for people who wish to download an app / use the browser and start calling immediately without touching any settings.
Google Voice is available everywhere with a little effort. I've used it outside of the US for over 10 years.
Even without GV there are other lower cost options. The actual (wholesale) cost of these services are around what GV charge or less, a 5+ times mark up is pretty rich.