There are a couple of Bundles on Itch.io's bundle page, but there is a larger one in the works https://www.pcgamesn.com/itch-io-bundle-for-ukraine -- According to this article the creators are hoping to push it out for availability on the 7th.

Meanwhile, not for Ukraine, but trans rights in Texas, there is an absolutely phenomenal TTRPG bundle: https://itch.io/b/1308/ttrpgs-for-trans-rights-in-texas