VOIP services

Years ago, I used Skype and also had a beta invite to Google Voice I had for years for free until they canceled my account for inactivity (after a rather short term of not using.) I have Callcentric now for my home landline and one other outbound only number for reasons... They just don't let you buy new numbers like you used too. Just curious what anyone else uses for voip. I'm considering building an asterisk machine as well. Cactus.