Ishad Nha

In Windows there is DosBox 0.74, which runs most of the old games. It is a freeware program too.

Windows has a Compatibility Wizard that tries to make programs run, programs that worked on earlier versions of Windows. Go into Windows Explorer and right-click on the program concerned. 
Does Mac have an equivalent of this Wizard?

3D Editors work on Windows well enough, if only through the Compatibility Wizard.
 

Check the Blades of Exile page for the links concered...

You can also edit the preferences file:

If you need to use the Editor, you may not have a good party line-up.

Pass Portal works much better than the documentation suggests. It usually requires only one casting and it also handles traps...

For exploring, Strength usually is thus not much of an issue.

You can use your Journal to keep track of locks that still need a special key for.

A quick port (translation) of N:R to a more recent engine would not take too long.
N:R itself is simply a port of the original Nethergate to the Blades of Avernum engine. N:R could be ported to the recent Avernum 3 remake engine.
It all depends on how much time Jeff has to spare... Possibly not a lot...

I like the story and the game play, so the format is negotiable to me.

As for a third version of Nethergate, not likely to happen any time soon... Jeff will be busy with his new project, Queen's Wish. This may last a few years with a trilogy for all I know.

At the start you won't have a lot of money or equipment, fortunately you don't need all that much. Most equipment will be found while exploring, or taken from dead foes.
You can't create a PC with spells that are greater than level 3. Soon enough you can buy Health and Battle spells from Cormac.

I make sure that one Druid starts with Spirit Ceremony, just the thing for mass poisoning...

I give one level in the Healing Circle to the two front-rank (warrior) PCs. This one level gives them the Mild Healing spell, which they can use to heal themselves. Idea here is to avoid draining the spell energy of the two rear-rank (Druid) PCs. Cost is only 2 skill points...

If the game just freezes up, it may just a minimized dialog box sitting in the Taskbar. If there are two N:R buttons in the Taskbar, click on them one at a time...

If that does not work, game remains frozen, click on the game screen to check that it has not become unselected...

Movement is done through the Numeric Keypad, with the Num Lock always on.

I think the engine is okay...

Unable to access locations:
You must be registered to access the second half of the game.
Also, some places are not accessible until you have done something somewhere else, whatever that may be.

Word of Recall can cut out some of the repetitious travelling over the same areas.

"Unplayable", 

If you mean you can't win because you keep getting wiped out... It can be played through to the end easily enough. If you have the right sort of party...

If you mean that you don't like features of the game, that is a different matter I suppose.

You can simply save a legacy page straight to your site. I don't know much about handling a website and whether this idea is possible.
If all else fails, you can paste the source code (from the legacy page) straight into a new page on your own site.
Ctrl + U will bring up the source code for each page...
Of course you will probably need to change a lot of the (obsolete) links.😎

As for a curator of the new site, one of the Global Moderators from this site should have what it takes, and hopefully has the time.

Seems like Jewels/Balladeer has lost her interest in Blades of Exile, Blades of Avernum!
If that is the case, one of the senior members of this forum will need to assume management of True Site for Blades.

Jewels' Facebook page is:

[personal information redacted]

Someone who knows her well could send her a personal message.

No reply to my message to Jewels. Now she is "Balladeer". Her page shows:

Last visited

February 4, 2017

Read this topic, especially March 20:

http://spiderwebforums.ipbhost.com/topic/24134-fastest-way-to-advance-time-to-day-160/

Can't find the site at its listed address: http://www.truesite4blades.com/
All I get is a blank screen.
I can access the site through the Wayback Machine:
https://web.archive.org/web/20180326165029/http://www.truesite4blades.com/

It also affects sites that are accessed through True Site for Blades, like The Blazing Blade.

I sent a PM to Jewels, so far no reply.

I simply make a written list of them as they are encountered...

I included a solution to this problem in the topic
"Fastest way to advance time to day 160?"

You can insert this code into the "beginstate INIT_STATE;"  of any town script:
        sf(6,11,1);
        change_coins(-5);
Code takes effect when you visit the town concerned. Shayder is town t4.
File path is something like:
\Spiderweb Software\Avernum 3 - Ruined World\Avernum 3 Files\Scripts

That works okay.

But you can't read the other three spellbooks, the magical defenses can see right through the fake rings!

Level 3 Divine Fire for non-Anama, can't find this anywhere...

Temporarily joining the Anama until you get what you want, then you leave them. This is a solution but not a satisfying one.

Gremlins, Squiggus, reward is Mass Healing.

Where is Summon Aid found?

By day 160 you may have finished the game. To get the Tower quest to start when it is convenient to you, insert this into beginstate INIT_STATE of the town script of any town you will soon be visiting:
        sf(308,5,1);

(a) alter the town script, visit the town and then leave
(b) undo the alteration to the script.
(c) you should start to get the disaster messages within hours or days of game time.         
        
First message should be: "Suddenly, without warning, you feel a vicious mental jolt. As your head clears, you feel that something horrible has happened, but you haven't the slightest idea what."    
This I tested, I found it to work properly.

If party gains Dark Thoughts, a variety of Dread Curse:
This has no prevention and no cure that I know of. To get rid of the Dark Thoughts, put this in a town's Init State:
if (has_spec_item(65) > 0)
    set_spec_item(65,-1);
    
This assumes the party has only one instance of Dark Thoughts. If party has two instances, change last line to:
    set_spec_item(65,-2);

This Dark Thoughts is not very heroic, I think it is a bad idea...

Blades of Exile was successful while BoA was not. Maybe the problem with the latter was that it required you to learn scripting? Also, the calls were not easy to remember?