Tooting our own horn here but you can try out MapTool for free since it's opensource and will always be free.
To get over the initial "um, where do I start?" there are several youtube videos and a friendly Discord server not to mention a forums with over a decades worth of info...
https://www.rptools.net/
You can visit my links below to grab a Pathfinder 1E campaign and a sever invite to Discord.
I'm currently working on a Pathfinder 2E campaign but it's still rough around the edge and hoping for an API still from LW for HLO. I play face-2-face so my campaigns revolve around that, but there are other frameworks out there for PF1E.
Note: We support HL classic by directly reading the portfolio for character import (my framework then stats out PF1E characters from this). For 2E, MT has full RESTful macro support that will hopefully be enough to interact with HLO for character data.