WordNet (r) 3.0 (2006):

tried and true
    adj 1: tested and proved to be reliable [syn: tested, time-
           tested, tried, tried and true]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "tried and true":
   acknowledged, admitted, blase, committed, confirmed, constant,
   conventional, cosmopolitan, cosmopolite, customary, dedicated,
   dependable, devoted, established, experienced, faithful,
   faithworthy, fast, fixed, folk, hallowed, handed down, heroic,
   hoary, immemorial, incorruptible, inveterate, inviolable, knowing,
   legendary, long-established, long-standing, mature, matured,
   mythological, not born yesterday, of long standing, of the folk,
   old, oral, practiced, prescriptive, proved, proven, received,
   recognized, reliable, responsible, ripe, ripened, rooted,
   sagacious, seasoned, secure, sophisticated, staunch, steadfast,
   straight, sure, tested, time-honored, to be trusted, traditional,
   tried, true, true-blue, trustable, trustworthy, trusty, understood,
   unfalse, unperfidious, untreacherous, unwritten, venerable,
   verified, veteran, world-wise, worldly, worldly-wise, worshipful