The server where a lot of friendships started is still around.
The server's IP is currently 188.8.131.52 and it uses the default port (27015) so you don't need to specify it, or you can use empyre.no-ip.org as the IP. To play there, you need the old pre-Steam Half-Life installed and patched to version 184.108.40.206, or the old CS CD patched to (IIRC) 220.127.116.11.
Here are the map packs. Downloading them will save a lot of time compared to downloading the maps from the server.
empyretfcmegapack1-14, 291,640 KB, contains all the maps in map packs 1 - 14
empyretfcmappack1, 11,192 KB, contains enclave, evacuate, firefortress, nml2, rats_cmd, rats_ctf, smooth, spaceball, and vidar2
emyretfcmappack2, 11,840 KB, contains acropolis2, ceasefire, cornfield, knightsnipe1e, osaka, shortbus2, the_valley_2, turkeyburgers_tfc
empyretfcmappack3, 16,892 KB, contains 2desert, darkness2, fortsake2, gustavo8_orbital, gustavo10_corps68, gustavo17_nostromo, maya, nml3, wstland3
empyretfcmappack4, 11,392 KB, contains abszero, cumbersome, cydonia2, exhale, magic, magic_n, mortality, overlook, pushed, samurai, theft, villahunt
empyretfcmappack5, 15,004 KB, contains 2morfort1_1, 3drylakes, 4pyramids, 187killingrounds3, beerrun_r, dusk, knight1g, nml, nougat, pyramid, rampage, thehole, thekeep
emjpyretfcmappack6, 20,952 KB, contains curse2, curse, dcompound, defcon, mrdrball2c, murderball, tiger, totalwar, vidars, wrath, xenzone
empyretfcmappack7, 29,672 KB, contains 2mesa3, armageddon, bam, bases2k1, btube, genome, hadley, livewire, meltdown1, mulch_trench, nuclear, renegade, roasted_l, run, scrummage, security, seizure, spacedout, tanis, tatooine, torch2, turnon
empyretfcmappack8, 24,180 KB, contains 5hells, adobefort_r, archimax, banana_r, bases_r2, bbombard, cabelstfc, carnival2, con1, congestus, cranetop, de_dust, donut_sumo, driver_tfc, escape_usa, flagcontrol3, forever2, high_flag, mathockey, mittsu, monkey_l, openfire_l, palermo, smallfort, temple, tls_facility, twilight_l
empyretfcmappack9, 15,168 KB, contains 2silo, bozz_4f, castlesplit, castlewars, chimkey_l, hitnrun, mulch_faf, mulch_fnf, pitfall, prodigal_r, shortbus3, skeeball_beta04, spacefort, startec
empyretfcmappack10, 23,124 KB, contains chemfort, creek, dragonfire, dustplate_a, fortsin_beta1, frostbite, gattaboo, groundhog, helix, hypercube_b3, mookville, pantswar, pointeduhoc, shortbus1a, shortbus25, shortbus25a, shutdown2, slamfort, slanted, xmaswell3, xmaswell
empyretfcmappack11, 36,024 KB, contains arid_tfl, arise, castlemertz, dustbowl_space, firemesa_b2, fry_baked, gleadhraich_r, hollow, insurrection_r, monkey_madness_r, oppose2k1, overload_r, raw_r, redgiant, s_mentality, ss_nyx_l, tempest_r3, well_now, yeger_wig
empyretfcmappack12, 20,876 KB, contains adrenal, atrox, chemfort_l, hypercube_b7, midnightskirmish, navarone, nothing, osaka_r, sandbowl_r, shoobuh, stoned, underground
empyretfcmappack13, 8,196 KB, contains beach_war, flaghunt, nao_2fort, nao_hunted, nao_well, rats_ctf, sepralis, shortbus1a, snipecc, tfc_dday2, the_valley_2
empyretfcmappack14, 29,968 KB, contains 4snipev2, baghdad!, Betrayed, crude_control, duality, goregasm, hellion, hypercube_b9, ksour_rc1, mooncheese, mortality_l, overload_r, peak, whiteout, woa, wrath, yeepball
neotf-1.8.1, 825 KB, contains the NeoTF files needed for my server.
And finally, here is the optional sound pack so you can hear the sounds triggered by saying certain things in chat: gan_soundpack, 4,829 KB, requires the excellent and free 7zip to extract.