Here's a HUGE list of surf maps for csgo and tf2. I'll try my best to keep it updated.

My surf maps:
surf_air_arena_v4
surf_air_arena_v4_night
surf_complex_b2
surf_pulse_v2
surf_revolution_v1
surf_snow_arena_v2
surf_utopia_v3

Other original surf maps:
surf_4ways_b1
surf_apotheosis_v2
surf_avatar
surf_clouds
surf_dicks_v4
surf_fantastic_v3
surf_greatfissure
surf_jsr_test3
surf_serpent_v6
surf_rebel_redone
surf_tf_greatriver_v1_b1
surf_tf_japan_v1

Converts:
surf_10x_reload_tf2
surf_110b_austinpowers_v2
surf_1930s
surf_1day
surf_2big2surf_b19
surf_2heaven_b3
surf_aaaa_reloaded
surf_abhorrence_njv
surf_adverse
surf_adverse_no_cp
surf_ag_texture_final
surf_ag_textures_pyramid_tf2
surf_agrumes
surf_akai_f1n4l
surf_akron_noobs_v2
surf_alpine
surf_alternation
surf_amplitude_apex_b1
surf_amplitude_encore
surf_amplitude_light
surf_animals
surf_annoyance
surf_aurantia-grisea
surf_badlands_r1
surf_basewar_beta3
surf_basewar_beta3_no_cp
surf_bathroom_final
surf_blockfortv1
surf_BlueTowers_v5F
surf_bob
surf_boost_for_thirty_remix
surf_boring
surf_buck-around_tf2
surf_buck-ed_up_tf2
surf_buck-fever_tf2
surf_buck-wild_fix
surf_buck-wild_tf2
surf_carnation_beta1
surf_catalyst
surf_catalyst2
surf_ck_arena_big_v1
surf_codeprotected_v2
surf_colos2
surf_commune_again_beta5
surf_commune_too_beta5
surf_compulsive_hard
surf_compulsive_njv
surf_concept
surf_congo_black
surf_crzyfrog_reloaded
surf_ctf_velocity_tf2
surf_curious
surf_danisharena_final
surf_deceptive
surf_delusion
surf_desolation
surf_destiny
surf_digital[g]beta_fixed
surf_drought_light2
surf_dust_paradise_final_2
surf_dusty_roads
surf_eclipse
surf_elements_beta3
surf_elites-v1
surf_ember
surf_empyrean_beta
surf_escapism
surf_eternity_v2
surf_euphoria
surf_exogenesis
surf_faceoff_remix_final
surf_fastspiral_retro_tf2
surf_firingrange_hdr_v2
surf_fizzycave_reloaded
surf_flixy_v2
surf_forbidden_tomb
surf_forbidden_tomb2
surf_forbidden_tomb3
surf_forbidden_tomb4
surf_forbidden_ways_2nd
surf_forbidden_ways_njv
surf_forbidden_ways_reloaded
surf_frequency
surf_fruits
surf_funpark_reloaded_v1
surf_funzor_reloaded
surf_fury_v5
surf_fusion_final
surf_gforce
surf_graphia
surf_grave_reloaded
surf_greatcanal_v3
surf_greatriver
surf_green_impact_fix
surf_hang_time_reloaded_v2
surf_hurrr
surf_hydrogen_arena
surf_hydrogen_v2
surf_hyper-tension
surf_insignia_b1
surf_intrepid
surf_imex
surf_injustice
surf_insanity_tf2
surf_japan_reloaded
surf_japan_v8
surf_jenocide
surf_killer
surf_leet_xl_r12
surf_leet_xl_xtreme_b1
surf_legendary
surf_legends_lite_v2
surf_lewler_v6
surf_lexia
surf_liberation
surf_liberation2
surf_lithium_v2
surf_lithium2
surf_lodypreview
surf_lore
surf_lost_civilization
surf_machine_remix_v5
surf_mai_redone
surf_mai_remix_v3
surf_mash-up
surf_meister_v3_final2
surf_melons_v1
surf_missing_no
surf_nerd-factory_v2
surf_ny__resist
surf_ny_advance_b5
surf_ny_bigloop_tf2
surf_ny_exploder_prime
surf_ny_master_exploder
surf_ny_momentum_v5
surf_ny_platinum_b5
surf_olympics
surf_omnibus
surf_parrot_selector
surf_plaguelands_beta7a
surf_porn_fix
surf_pox
surf_prime_time
surf_prolix
surf_Qlimax
surf_quantum_b3
surf_rebel_resistance_b3
surf_redemption_b1
surf_retroartz
surf_shotgunduel_beta
surf_simpsons_source
surf_slingshot
surf_snipers_island
surf_spankme
surf_spaze
surf_spectrum
surf_style_final_v2
surf_sundown
surf_superk
surf_supermario
surf_supersurf_v2
surf_swift
surf_syria
surf_taq
surf_the_flow
surf_the_gloaming
surf_the_hills
surf_thembrium_final
surf_this_njv
surf_thriller2_tf2
surf_tilt2
surf_toast_redone_v2
surf_togo
surf_torque
surf_torque2
surf_trance_v1
surf_tronic_njv
surf_underearth
surf_velocity
surf_vippers
surf_wavelength_v2
surf_x4v_final
surf_xiv_v2a_b1
surf_Xpipe_v10
surf_year3000
surf_zaza

New surf maps:
1/11/11
surf_togo

1/26/11
surf_1day

2/6/11
surf_underearth

2/8/11
surf_the_hills

2/10/11
surf_ck_arena_big_v1

2/11/11
surf_aurantia-grisea
surf_carnation_beta1

5/10/11
surf_lodypreview

5/14/11
surf_lost_civilization

5/17/11
surf_insignia_b1

7/15/11
surf_abhorrence_njv

7/21/11
surf_forbidden_ways_njv

7/23/11
surf_mai_redone

7/26/11
surf_intrepid
surf_buck-wild_fix

Please let me know if anything needs to be corrected or updated.