Currently d912pxy works with

1. ArcDPS - DPS metric and general multitool addon http://www.deltaconnected.com/arcdps/
2. GW2Radial - customizable radial menu overlay to select a mount, novelty item and more https://github.com/Friendly0Fire/GW2Radial
3. ReShade 4.3 - generic post-processing injector for games and video software https://reshade.me/
4. GW2 Taco - Guild Wars 2 Tactical Overlay GW2 http://www.gw2taco.com/
5. Blish HUD - https://github.com/blish-hud/Blish-HUD
6. Virtually any other overlay that working without d3d injection or works via addon loader

Other tools like nvidia shadowplay, obs, discord overlay typically work, but can be unstable for some reasons. Note that compatibility on win7 is very very limited due to dx12 port to win7.

Use the addon manager or follow these naming rules to make specific addons work together:

ReShade should be installed as dxgi.dll and have dx12 support (version 4.3 and up) (probably you need to put it next to Gw2-64.exe) 

If you use GW2Radial install d912pxy as d912pxy.dll

If you use ArcDPS but not GW2Radial, install d912pxy as d3d9_chainload.dll

If you use ArcDPS and GW2Radial, install ArcDPS as d3d9.dll, GW2Radial as d3d9_chainload.dll, and d912pxy as d912pxy.dll

Alternative description for reshade => https://github.com/megai2/d912pxy/issues/38#issuecomment-520420672