Q:

How can I find journals in my field that do not charge author fees?

I am in search of an algorithms journal that does not ask for publication fee.
It doesn't matter to me whether it is an open-access journal or not.
I have been searching for journals with no publication charges journal for a while, but have been unable to find any such journals.
Are there any resources that can help me locate journals that do not charge authors publication fees?

A:

You can use websites like DOAJ.org to search for relevant open access journals that do not charge publication fees. 
This example query for 'algorithms' reveals 40 such cost-free open access journals, some of which may be relevant to you, depending on what exact type of algorithm you're publishing.
Using this I found The Electronic Journal of Combinatorics & Image Processing Online (IPOL Journal) which both look like reputable, high-quality, publication-fee-free, algorithm-relevant journals to me.
Some of the information is a little out of date though, for instance the journal Algorithms (MDPI) I think now charges 300 CHF (Swiss Francs) although initially it was free, in the past.

