The most reliable international agency to donate money for Palestinians is the United Nations. The UNRWA is the United Nations Relief and Works Agency created to specifically help palestine refugees. You can donate to them online - https://donate.unrwa.org/
They have been, and even now, are very active in Gaza:
The Gaza Strip has a population of approximately 2.1 million people, including some 1.7 million Palestine Refugees. For at least the last decade and a half, the socioeconomic situation in Gaza has been in steady decline. A blockade on land, air and sea was imposed by Israel following the Hamas takeover of the Gaza Strip in 2007. There are now very few options left for the people of Gaza, who have been living under collective punishment as a result of the blockade that continues to have a devastating effect as people’s movement to and from the Gaza Strip, as well as access to markets, remains severely restricted.
... Food security in Gaza has deteriorated with 63 per cent of people in the Gaza Strip being food insecure and dependent on international assistance ... With 81.5 per cent of the population living in poverty, an overall unemployment rate of 46.6 per cent (48.1 per cent for Palestine Refugees living in the camps) at the end of the third quarter of 2022 and an unemployment rate of 62.3 per cent among youth (15-29 years, refugees and non-refugees), the already fragile humanitarian situation in Gaza threatens to deteriorate further ... Clean water is unavailable for 95 per cent of the population.
... Notwithstanding the Agency’s ongoing funding crisis, which has forced UNRWA in Gaza to take mitigating measures, particularly with regard to its emergency interventions, UNRWA continues to:
- Improve the academic achievement, behavior, and values of school students.
- Focus on the overall health and well-being of Palestine Refugees by providing Primary Health Care. The main provided service areas include infant and child health care, maternal health care, health care of patients suffering from communicable and non-communicable diseases, mental health psychosocial support, in addition to the outpatient services and the provision of essential medication and life-saving hospitalization coverage.
- Construct desperately needed infrastructure, including schools and shelters Improve the quality and targeting of its food and cash assistance to the poorest of the poor.
- Promote gender equality and human rights for all.
Source: UNRWA - Where we work
Israel deliberately targets UNRWA workers and camps because some of them are Palestinians and so obviously support the resistance against Israel, while the Israeli-right prefers to call them terrorists.
152 UNRWA staff have already been killed and 145 UNRWA facilities damaged by bombardment. UNRWA is the largest humanitarian agency in Gaza and their delivery of humanitarian assistance cannot be replaced by other agencies working in Gaza. If the funding suspensions are not reversed we may see a complete collapse of the already restricted humanitarian response in Gaza.
With approximately over one million displaced Palestinians taking shelter in or around 154 UNRWA shelters, the agency and aid organisations have continued to work in near impossible circumstances to provide food, vaccinations, and freshwater. The countries suspending funds risk further depriving Palestinians in the region of essential food, water, medical assistance and supplies, education and protection.
Source: UNRWA funding cuts threaten Palestinian lives in Gaza and region, say NGOs