Can I run OSC and SACN on my EOS Ti?

Yes, it is possible. What did you mean with "how many networks can I run out..."? An EOS TI have two network port which allows you to run two separate networks (IP range and subnet).

Can it run more than 2 if I get a router and switch? 

What did you mean with 2? What is your network layout? The Ti has only two separate NICs. This is often used to seperate sACN and ArtNet with different IP range and subnet. Or maybe to use the second port for remote control for OSC and others. Have a look to these articels support.etcconnect.com/.../Network_Design

What did you mean with 2? What is your network layout? The Ti has only two separate NICs. This is often used to seperate sACN and ArtNet with different IP range and subnet. Or maybe to use the second port for remote control for OSC and others. Have a look to these articels support.etcconnect.com/.../Network_Design