Here are the classes, structs, unions and interfaces with brief descriptions:

C_tag_menuframework
C_TargaHeader
Cadivtab_t
Caffinetridesc_t
Caliasbatchedtransformdata_t
Caliastriangleparms_t
Calight_t
Careanode_s
Cbeam_t
Cbedge_s
Ccarea_t
Ccblock_t
Ccbrush_t
Ccbrushside_t
Ccdlight_t
Ccentity_t
Cchallenge_t
Cchannel_t
Ccheatvar_t
Ccinematics_t
Ccl_sustain
Ccleaf_t
Cclient_frame_t
Cclient_persistant_t
Cclient_respawn_t
Cclient_s
Cclient_state_t
Cclient_static_t
Cclientinfo_t
Cclightstyle_t
Cclipplane_s
Ccmd_function_s
Ccmdalias_s
Ccmodel_s
Ccnode_t
Cconsole_t
Ccplane_s
Ccsurface_s
Ccvar_s
Cdaliasframe_t
Cdarea_t
Cdareaportal_t
Cdbrush_t
Cdbrushside_t
Cdedge_t
Cdface_t
Cdheader_t
Cdibinfo
Cdirty_t
Cdleaf_t
Cdlight_t
Cdma_t
Cdmdl_t
Cdmodel_t
Cdnode_t
Cdpackfile_t
Cdpackheader_t
Cdplane_t
Cdrawsurf_t
Cdsprframe_t
Cdsprite_t
Cdstvert_t
Cdtriangle_t
Cdtrivertx_t
Cdvertex_t
Cdvis_t
Cedge_s
Cedgetable
Cedict_s
Cemitpoint_t
Centity_s
Centity_state_s
Cespan_s
Cevert_t
Cexplosion_t
Cfield_t
Cfilelink_s
Cfinalvert_s
Cfloodfill_t
Cframe_t
Cgame_export_t
Cgame_import_t
Cgame_locals_t
Cgclient_s
Cgitem_armor_t
Cgitem_s
Cglconfig_t
Cgllightmapstate_t
Cglmode_t
Cglpoly_s
Cglstate_t
Cgltmode_t
Cglvert_t
Cglwstate_t
Cgraphsamp_t
Cidentitypalette_t
Cimage_s
Cipfilter_t
Ckbutton_t
Ckeyname_t
Claser_t
Clevel_locals_t
Clightstyle_t
Clink_s
Cloopback_t
Cloopmsg_t
Clump_t
Cmapsurface_s
Cmedge_t
Cmenuaction_s
Cmenucommon_s
Cmenufield_s
Cmenulayer_t
Cmenulist_s
Cmenuseparator_s
Cmenuslider_s
Cmframe_t
Cmiptex_s
Cmleaf_s
Cmmodel_t
Cmmove_t
Cmnode_s
Cmodel_s
Cmonsterinfo_t
Cmoveclip_t
Cmoveinfo_t
Cmplane_s
Cmsurface_s
Cmtexinfo_s
Cmvertex_t
Cnetadr_t
Cnetchan_t
Coldrefdef_t
Cpack_s
Cpackfile_t
Cparticle_s
Cparticle_t
Cpartparms_t
Cpcx_t
Cplayer_state_t
Cplayermodelinfo_s
Cplaysound_s
Cpml_t
Cpmove_state_t
Cpmove_t
Cpolydesc_t
Cportable_samplepair_t
Cpushed_t
Crefdef_t
Crefexport_t
Crefimport_t
Csearchpath_s
Cserver_static_t
Cserver_t
Csfx_s
Csfxcache_t
Csizebuf_s
Cspanletvars_t
Cspanpackage_t
Cspawn_t
Cspawn_temp_t
Csurf_s
Csurfcache_s
Cswstate_s
Cswwstate_t
Ctexinfo_s
Ctrace_t
Cucmd_t
Cusercmd_s
Cviddef_t
Cvidmode_s
Cvrect_s
Cwavinfo_t
Czhead_s