Plotting rosbag topics in a single plot

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I have a (large) rosbag. I want to plot a few of these topics (in the same plot). I don't need any playback feature.

I can load the bag with rqt and plot topics, one topic per plot. But can I have more topics in the same plot? Another disadvantage is, that it requires a running roscore.

Are there any other tools that allows me to extract selected topics from a rosbag and plot them? Bonus points if I can have a tool that:

1. does not require a roscore running
2. runs on Windows as well