  We present a first look at the reddest 2-5$\mu\rm m$ sources found in deep
images from the GLASS Early Release Science program. We undertake a general
search, i.e. not looking for any particular spectral signatures, for sources
detected only in bands redder than reachable with the Hubble Space Telescope,
and which would likely not have been identified in pre-JWST surveys. We search
for sources down to AB $\sim 27$ (corresponding to $>10\sigma$ detection
threshold) in any of the F200W to F444W filters,with a $>1$ magnitude excess
relative to F090W to F150W bands. Fainter than F444W$>25$ we find 56 such
sources of which 37 have reasonably constrained spectral energy distributions
to which we can fit photometric redshifts. We find the majority of this
population ($\sim$ 65%) as $2<z<6$ star forming low-attenuation galaxies that
are faint at rest-frame ultraviolet-optical wavelengths, have stellar masses
$10^{8.5}$-$10^{9.5} $M$_\odot$, and have observed fluxes at $>$2$\mu \rm m$
boosted by a combination of the Balmer break and emission lines. The typical
implied rest equivalent widths are $\sim200\unicode{0x212B}$ with some extreme
objects up to $\sim 1000\unicode{0x212B}$. This is in contrast with brighter
magnitudes where the red sources tend to be $z<3$ quiescent galaxies and dusty
star forming objects. Our general selection criteria for red sources allow us
to independently identify other phenomena as diverse as extremely low mass
($\sim 10^8$ M$_\odot$) quiescent galaxies at $z<1$, recover recently
identified $z>11$ galaxies and a very cool brown dwarf.
