In San Diego there is a group called Sunday Assembly. They regularly feed the homeless.

Heifer International has no religious overlay, has the highest ratio of money into deeds vs. "overhead" and it is really fun to browse the myriad animals/bees/seeds you can choose to send! And not too much begging for support.
Smile Train (volunteer doctors go worldwide to fix cleft palates) is another i support...so laid-back they seldom send out literature!

Jerkin' off!

Rotary is overall non religious, some clubs say grace, it’s up to the individual club. They do some great work and charge no admin fees for doing it; as they are totally volunteer run.

I have a friend that runs a pagan food pantry in Richmond, Va. Yes, it's sorta of religious (being pagan), but they require nothing. They don't ask for a reason why you're there, they just want to help.

At the moment it's the only charity I give money to. At least I know she's trustworthy and does what she says she will do.

I'll a little local promoting here, out in the local area of the presently VERY arid Outback of Australia, we have a little group of retired, Atheist Aussies who put their minds and skills together, invented, built and have patented, at their own expense btw, a new device for drilling bore-holes for water.
It costs less to run and operate,etc, than a conventional drilling rig, is far more mobile, uses only the water it carries around with it and can drill through very hard rock layers down to a present depth of 310 metres in approx. 4 to 6 hours.
They call themselves " The Bush Bores, " a kind of pun/joke, they charge little or nothing for their services except coverage of the costs of diesel fuels and so far, unpublished, have drilled an approx. total 47 successful Bore-holes within a 600+ kilometre radius of their 'home-base.'

I did a search and found quite a few, so my question has been answered.

The answer is yes. And there are many.

You may want to contact the Unitarian Universalists [en.wikipedia.org] nearest you. They are a good place for agnostics and atheists to fellowship and do humanitarian activities together.

What about the 'White Helmets' in Syria?

Why should it matter or be separate?

@alon

Another unanswerable question. Look it up.