The free version of Glasswire is great to complement the base Windows Firewall and it offers more granular, manual control over inbound/outbound connections, while the paid version includes some interesting functions such as the the "Block all mode" which stops all incoming/outgoing connections in the host PC.
It must be noted however, that it is entirely possible to achieve many of these functions using alternative (and sometimes more matured) software such as Outpost Firewall (paid, but many of its functions can be found in the free version of Outpost Security Suite), Privatefirewall (free), COMODO Firewall (free) or BiniSoft Windows Firewall Control (free).
Many of the above firewall packages also offer additional security mechanisms to further enhance the overall security of your PC, in case you were looking for additional layers of security other than a network firewall.