Loupe Desktop's session viewer has a two-tiered filter structure currently - one done by the items you select in the tree views for classes & categories and another that supplements it done in the grid itself; what are you looking for from multiple filters more specifically?

Peter had replied by email with a clarification a while ago, but that doesn't automatically post to the thread.

Here's what he said:

Hi Kendall,

I talking specifically about the “Live View” of a live process. As far as I’m aware it only offers the capability to filter by category of message, and when search is used it filters out non-matching messages (i.e. “content” filter). So it’s not possible for example to have multiple content filters, and there’s no capability to highlight matching messages (i.e. while still displaying all non-filtered messages, which is more how search works in the historic session viewer).