Well,
there is TCAS/ACAS, which relies on transponder in the other ships. You wonˋt get indications of gliders.
there is FLARM, which was developed for gliders turning at close distance in the same „bart“(upwind), but FLARM wouldn’t show GA aircraft with transponder
And there is
Power Flarm, which will give you information about gliders and other aircraft
I personally think, you shouldnˋt rely on it, but you get a lot more aircraft to see, when you use it.....
With a good lookout and a warning from the unexpected, you increase safety.