The best replacement for trx is crossfit.

The best alternatives to trx are rated as following:
★★★★★  crossfit
★★★★★  jungle gym
★★★★  rip 60
★★★★  rings
★★★★  weights
★★★  yfz
★★  jungle gym xt
★★  resistance bands
★★  bodylastics
★  woss
★  nrx
★  total gym
★  kettlebells
★  gym
★  yzf
★  gymnastic rings
  xtrx
  human trainer
  gofit
  ltr
  450 yfz
  yamaha raptor
  lifeline
  ring training
  yfz 450

Your alternative for trx is not listed? Suggest!
Speaking about trx, one probably shouldn't forget about bosu.

Other search terms related to trx and their ratings are:
★★★★★ bosu
★★★★★ p90x
★★★ kettlebell
You have in mind a companion for trx and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of trx in all years. Click on graph for more.
trx
crossfit
jungle gym