One piece of gear that has greatly increased the safety of cross country flying in recent years is the satellite tracker. This device allows position reporting and text and/or email communication while out of cell phone service range.
CIVL safety handbook
A very comprehensive source for safety in free flight from the FAI (International Aviation Federation)
BHPA safety page
The Safety page from the British Hang Gliding and Paragliding Association
FFVL safety page
The Safety page from the French Federation of Free Flight http://federation.ffvl.fr/pages/securite-et-technique and http://www.efvl.fr/sites/efvl.fr/files/2014_Livret_FFVL_9BD.pdf