It might be incorrect for me to call this "free jazz," but since the early 2000s saxophonist Wayne Shorter has played with a band featuring bassist John Patitucci (who was in the Chick Corea Elektric Band), drummer Brian Blade, and pianist Danilo Perez. This band plays in an acoustic style, but it's not in the style of Wayne Shorter's 1960s Blue Note work; instead, it's in a very "free" style of jazz. I'd check out "Without a Net" (2013) and "Emanon" (2018). I had the opportunity to see this band live at the San Francisco Jazz Center twice: once in 2015 and another time in 2017.