Unofficial Google Drive Client `Insync` Pricing Revealed, Out Of Beta For Windows And Mac

Insync, an unofficial, cross-platform Google Drive client is out of beta for Windows and Mac OSX and with this, the pricing has been revealed.
Since Google hasn't yet released a Google Drive client for Linux and Grive seems to have been abandoned, many Linux users are using Insync. However, the Insync developers have stated that their tool will only be free while in beta, and the price hasn't been known until today.