Open Access journals can be found in
Books and book publisher are found in DOABooks.org (Directory of Open Access Books).
Reliability of open access journals is checked in the same way as for traditional scholarly publications. Check:
Another very good checklist: Think Check Submit.
NB! Don't respond to flattering e-mail offers from predatory journals and unreliable book publishers. Publishing with them may harm your reputation.
There are publishers with murky motives. These predatory publishers (or vanity publishers) are primarily interested in collecting APCs and publish material without proper review procedures. They send out tempting spam messages and offer fast publication and membership in editorial boards etc. to make researchers pay the fees.
Reliable journals are found by following the advice on Think, check, submit: http://thinkchecksubmit.org
Sometimes bibliometric measures are used to judge journal impact.
Jufo | Impact Factor | H-index | SNIP | Eigenfactor metrics | Journal Immediacy Index | SCImago Journal Rank (SRJ) | CiteScore
The measures are not reliable for for instance topic relevance (which is decisive for choosing the right publication venue), they may be misleading and they can be played. Also some can't be applied to all journals, for instance some languages and fields of research are not indexed or only partly indexed in the databases underlying the metrics. It also takes time (sometimes years) before new journals are indexed.
Here is a description of the measures.