Does Google still offer free incoming/outgoing voice calls with any of their Android services? On Android, is Google still offering free incoming or outgoing voice calls to landlines/cellphones through any of their services?

It seems like they keep changing it, and everything I read has conflicting information.

Note that I'm talking specifically about VOIP to landline or cellphone, not VOIP to VOIP.
"Most" calls to numbers in the US and Canada are free through Hangouts as long as you are also in the US/Canada. This is noted in Google's support pages and you can find all of the rates on this page. You need the Hangouts Dialer app in order to place a call.

There is no specific listing of the US/Canada numbers that incur a charge (it's $0.01 per minute), but you you can look up the rate for any number on the Google Voice calling credit page (requires signing into your Google account).