Held in conjunction with local Linux user group, Linux Users of Victoria, the event will begin at noon at the Electron Workshop co-working space at 31, Arden Street, North Melbourne.
A statement from the organisers said: "It's that... time of the year we look at how we might keep our increasingly digital lives under our our own control and prevent prying eyes from seeing things they shouldn't."
Software Freedom Day is marked around the world with various groups drawing attention to free and open source software which is meant to guarantee the freedom of users.
There will be networking opportunities, introductions to local technology groups and a Linux installfest.
Entry is free and the event will end at 6pm.
Image: courtesy Red Hat