Most open access journals do not have an impact factor, but there are several OA journals that already acquired IF and they are widely cited, for instance:
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
Which has a good impact of 2.51 and publishes papers on GIS.
yes. one of its kind is stmjournals.com. STM publishes are included in the leading abstracting and indexing databases, including Indian Science Abstracts (ISA), NISCAIR, CSIR, India the Chemical Abstracts Services (CAS), American Chemical Society (ACS), USA.
No charges from authors for publishing their work and editorial services.