This contribution aims to study the nature (kinematic, nuclear activity, and stellar population) of a sample of 10 galaxies in the poor cluster Abell S0805. As no detailed optical spectroscopy for somemembers has been published yet, the selected sample makes this study ideal for investigating the properties of the following objects: ESO 104-G(002, 006, 007, 008, 009, 010, 013), Fairall 0187, and PGC (062384, 062391). Our main results were obtained after subtraction of the underlying stellar population with the spectral synthesis code STARLIGHT. The residual spectra reveal seven galaxies with only absorption lines [ESO 104-G(002, 007, 008, 009), Fairall 0187 and PGC (062384, 062391)], and three galaxies with emission lines [ESO 104G( 006, 010, 013)]. According to the boundaries in the diagnostic diagrams, the intensities of H alpha and the low-ionization lines ([N II]angstrom 6584A and [S II]lambda lambda 6716,6731 angstrom) suggest the following results: (i) the brightest cluster galaxy (ESO 104-G006, an elliptical cD galaxy) shows low-ionization nuclear emission-line region (LINER)-like excitation, quite common in 'cool core clusters'; (ii) the ESO 104-G010 ('X-Galaxy' or 'Crystal Frog') shows an excess of the nitrogen emission-line [NII] lambda 6584 angstrom not yet reported. We also suggest this object as a LINER; (iii) the spiral ESO 104-G013 is a star-forming galaxy with typical emission lines. No obvious signs of interaction were observed in this study. The heliocentric velocities agree within 1 sigma with the most recent values. The stellar population, rotation curves, and velocity dispersions are also discussed for the first time for some objects.