Here are the data structures with brief descriptions:

__lzo_pu32_u
__lzo_pu_u
_MEMFILE
_STRING
agOdalaunch::_STRING
AActor
acsdefered_s
ActionBits
actionf_t
ad_t
AG_LAUNCH_DATA
agOdalaunch::AGOL_About	The about box
agOdalaunch::AGOL_DirSelector	Directory selection dialog
agOdalaunch::AGOL_MainWindow	The main window
agOdalaunch::AGOL_Manual	The manual connect window
agOdalaunch::AGOL_Settings	The settings dialog
agOdalaunch::AGOL_Solo	The solo game launcher dialog
anim_t
Application
BanEntry_t
brain_s
brokenlines_s
buf_t
agOdalaunch::BufferedSocket
BufferedSocket
callback_data_t
castinfo_t
SDLVideo::cChain
CDoomError
CFatalError
channel_t
cheatseq_t
ClassInit
client_c
player_s::client_t
cliprange_t
cluster_info_s
CodePtr
CPSProcessSerNum
CRecoverableError
CS_Subst_t
CUSTOM_LAUNCH_DATA
CustomServer_t
agOdalaunch::Cvar_t
Cvar_t
cvar_t
CvarField_t
DACSThinker
DActiveButton
DArgs
DBoundingBox
DCanvas
DCeiling
DConsoleAlias
DConsoleCommand
DDoor
DEarthquake
DElevator
DFireFlicker
DFlicker
DFloor
DGlow
DGlow2
divline_t
DLevelScript
dlgAbout
dlgConfig
dlgMain
dlgServers
DLightFlash
DLighting
DMovePoly
DMover
DMovingCeiling
DMovingFloor
DObject
download_s
player_s::client_t::download_t
DPhased
DPillar
DPlat
DPolyAction
DPolyDoor
DPusher
drawseg_s
DRotatePoly
DScroller
DSectorEffect
DSeqActorNode
DSeqNode
DSeqPolyNode
DSeqSectorNode
DStrobe
DThinker
dyncolormap_s
event
event_t
agOdalaunch::EventHandler	An event handler
eventlist
FArchive
FFile
file_version
filelump_t
findstate_t
flagdata
fline_t
FLZOFile
FLZOMemFile
FPolyObj
frmOdaGet
FStat
FThinkerCollection
FThinkerIterator
FTPThread
gameborder_t
agOdalaunch::GameCommand
gameinfo_t
gamestring_s
gamewadinfo_t
gitem_s
agOdalaunch::GuiConfig
testupnpigd::handler_class
hexenseq_t
History
hostent
agOdalaunch::hostent	Standard hostent structure
HTTPThread
huffman
huffman_client
huffman_server
IGDdatas
IGDdatas_service
IInputDevice
IJoystick
IKeyboard
IMouse
intercept_t
islope_t
IVideo
JavaBridgeTest
Key
player_s::LastMessage_s
launchercfg_t
level_info_s
level_locals_s
level_pwad_info_s
line_s
linelist_t
LstOdaPlayerList
LstOdaServerList
LstOdaSrvDetails
lumpinfo_s
lzo_align_t
lzo_callback_t
lzo_full_align_t
MapInfoHandler
maplinedef2_t
maplinedef_t
mapnode_t
mappatch_t
mapsector_t
mapseg_t
mapsidedef_t
mapsubsector_t
maptexture_t
MapThing
mapthing_t
mapvertex_t
agOdalaunch::MasterServer
MasterServer
masterserver
md5_state_s
memblock_s
memzone_t
menu_s
menuitem_s
menustack_t
MessageTranslator
mline_t
mobjinfo_t
mpoint_t
msecnode_s
msg_info_t
dlgMain::mtcs_struct_t
dlgMain::mtrs_struct_t
MusicHandler_t
NameValue
NameValueParserData
netadr_t
NetIDHandler
node_s
NSApplication(SDL_Missing_Methods)
NSString
FArchive::ObjectMap
agOdalaunch::ODA_ButtonBox	Main button box
agOdalaunch::ODA_EventRegister	An Event Register
agOdalaunch::ODA_GuiOptionsBox
agOdalaunch::ODA_PlayersStatusbar	Players statusbar
agOdalaunch::ODA_QueriedStatusbar	Queried servers statusbar
agOdalaunch::ODA_SrvOptionsBox
agOdalaunch::ODA_Statusbar	Main statusbar
agOdalaunch::ODA_Thread
agOdalaunch::ODA_ThreadBase
oldmenu_s
oldmenuitem_t
PACKEDATTR
palette_s
particle_s
patch_s
plat_pred_t
player_s
Player_t
agOdalaunch::Player_t
playerskin_s
point_t
polyblock_s
polyspawns_s
PortMapping
PortMappingParserData
post_s
pred_both_t
pred_ceiling_t
pred_floor_t
protocol_t
pspdef_s
QueryThread
ReplacedStringTracker
SDLApplication
SDLMain
SDLVideo
sector_s
seg_s
Server
server
agOdalaunch::Server
ServerBase
agOdalaunch::ServerBase
agOdalaunch::ServerInfo_t
ServerInfo_t
sfxinfo_struct
side_s
sndseq_t
sockaddr_un
spritedef_s
spriteframe_s
st_binicon_s
st_multicon_s
st_number_s
st_percent_s
state_t
subsector_s
switchlist_t
szp< T >
TArray< T >
Team_t
agOdalaunch::Team_t
texpatch_t
texture_t
agOdalaunch::ThreadArg_t
ticcmd_t
Translate_ServerToTV
TThinkerIterator< T >
txt_button_s
txt_callback_t
txt_callback_table_s
txt_checkbox_s
txt_cliparea_s
txt_dropdown_list_s
txt_font_t
txt_inputbox_s
txt_label_s
txt_radiobutton_s
txt_scrollpane_s
txt_separator_s
txt_spincontrol_s
txt_strut_s
txt_table_s
txt_widget_class_s
txt_widget_s
txt_window_action_s
txt_window_s
TypeInfo
FArchive::TypeMap
UPNParg
UPNPDev
UPnPObject
UPNPUrls
URIHandler
usercmd_s
userinfo_s
value_s
vertex_s
SDLVideo::vidMode_t
visplane_s
vissprite_s
Wad_t
agOdalaunch::Wad_t
wadinfo_t
wbplayerstruct_s
wbstartstruct_s
weaponinfo_s
dlgMain::wtrs_struct_t
wxAdvancedListCtrl
agOdalaunch::Xbox	Xbox Class
xlat_t
xmlparser
zdemoheader_s