Free Alternatives to "Titanium Backup Pro"
I'm not aware of a full-blown replacement for Titanium Backup, but there are solutions for the specific functions you're after:

Recent versions of Link2SD can convert user apps to system apps and vice versa (available on Google Play).

SwitchMe offers a solution for switching among multiple user profiles (available on Google Play). The free version is limited to two profiles and "no security features".