The other method is by an examining trial. If you've ever watched the old Perry Mason then you've seen an examining trial. In an examining trial a judge hears evidence and decides whether or not there is probable cause for continuing to hold the accused for trial.
The accused in a felony case has the right to request an examining trial in his case. That being said, there are very few examining trials held because once the accused submits his request, the District Attorney's first instinct is to put the case before a grand jury. Once the grand jury indicts there is no need for an examining trial.
In a slow-moving case in which the accused is being held in custody awaiting indictment, a request for an examining trial is a very effective method of forcing the state's hand. In most cases the state would rather avoid an examining trial because the proceeding allows the accused to "pin down" the state's witnesses to a story without the state having time to "woodshed" them properly.