Hello,
No, I have never heard of Apache Guacamole.
-Which model Mac?
-Which version of OS X/macOS?
-What type of databases are you trying to access?
-Are you able to access the settings of your router, or is it owned by your ISP?
-There are many web-based remote access applications, like
TeamViewer,
Chrome Remote Desktop, etc., as well as numerous paid/free VNC clients.
C