  A less explored aspect of dwarf galaxies is their metallicity evolution.
Generally, dwarfs have lower metallicities than Hubble sequence late type
galaxies but in reality, dwarfs span a wide range of metallicities with several
open questions regarding the formation and evolution of the lowest and the
highest metallicity dwarfs. We present a catalogue of 3459 blue, nearby, star
forming dwarf galaxies extracted from SDSS DR16 including calculation of their
metallicities using the mean of several calibrators. To compile our catalogue
we applied redshift, absolute magnitude, stellar mass, optical diameter, and
line flux signal to noise criteria. This produced a catalogue from the upper
end of the dwarf galaxy stellar mass range. Our catalogued dwarfs have blue g -
i colours and Hbeta equivalent widths, indicative of having undergone a recent
episode of star formation, although their star formation rates (SFR) suggest
only a moderate to low enhancement in star formation, similar to the SFRs in
low surface brightness and evolved tidal dwarfs. While the catalogued dwarfs
cover a range of metallicities, their mean metallicity is about 0.2 dex below
solar metallicity, indicating relatively chemically evolved galaxies. The vast
majority of the catalogue, with clean photometry, are relatively isolated
dwarfs with only modest star formation rates and a narrow range of g - i
colour, consistent with internally driven episodic mild bursts of star
formation. The presented catalogue's robust metallicity estimates for nearby
SDSS dwarf galaxies will help target future studies to understand the physical
processes driving the metallicity evolution of dwarfs.
