Wave (https://www.waveapps.com/) works well for me. Admittedly, I have not explored things like accrual accounting (I just do everything on a cash basis), so I don’t know how well this is supported, and I’m perplexed that there is no easy way to generate EBITDA reports from within Wave itself, but basic tracking of expenses and transfers across multiple vendors and accounts works smoothly.

[Edit] Also, most CPAs I have talked with know and can integrate with Wave.