This is a list of the current solicitations available. You can navigate around to the different departments. They have a calendar of announcements and due dates.
If you click on the DoD SBIR[0] it brings up the available topics. Each period has different areas of interest. You create a little proposal and then they announce "Phase 1" awards. They usually have different terms, but I think it's typical to get up to 100k for 4 months. After your demo you can apply for Phase 2 which is more money over a longer term, after that you can move to Phase 3, commercialization, etc.
The problem is that you have to work on it "full time" or at least the principal investigator has to work full time. The other problem is that they give you the topics of interest. There are so many over all of the departments. The biggest are definitely HHS and DoD. There are a lot of ML/AI, IT, sensors, etc.
Unfortunately, the current cycle mostly ends tomorrow for DoD.
