ON1 have just announced and released their new standalone and integrated HDR packaged called HDR 2020. For those who have ON1 Photo Raw 2020 this is included within that package as a module whilst for others it is available as a standalone package. It is available on the website as a 30 day trial, or can be purchased for the introductory price of $39.99 USD (normally $49.99 USD).
A single purchase of ON1 HDR 2020 includes Windows and macOS versions, and allows for activation on up to five (5) computers. The App works as a standalone application and as a plugin for Adobe Lightroom Classic.