There are many organizations raising funds and collecting donations. Below is not a definitive list but it's a list of just a few links that is reliable. Before you support any resource, please make sure you know where you are sending your support.
Here are a few resources that you could consider supporting Check sources often as more organizations are adding fundraising components daily:
The Jewish Alliance of Greater Rhode Island stands with Israel and has opened an emergency fund to provide immediate financial assistance and relief to victims of terror and war. 100% of your donation will go toward supporting victims of terror and addressing the unprecedented levels of trauma caused by these horrific attacks.
Magen David Adom: https://afmda.org
The Jewish Agency’s fund for victims of terror, providing immediate assistance to terror victims: https://www.jafina.org/crisis-in-israel/
This organization is collecting funds to help those in need due to this catastrophe and distributing much-needed supplies to Israeli soldiers: https://justonechesed.org/aid4israel/