The UserLand Frontier Kernel is a powerful development platform including an integrated object database, scripting language, a script editor and debugger, outliner, a multi-threaded runtime and an integrated HTTP server. http://frontier.userland.com
I've never used Frontier, but was curious to try it. I'm running Mavericks.
The app runs, but asks me to 'select a database file'. I don't seem to be able to do anything besides that, and I'm not sure what kind of database file I need to give the app, to get further.
Saw Dave’s post today about his desire to port to Linux. I do not know C or C++, but would be happy to help in the event a port is feasible in Ruby, Node, or Python. My experience is in web development, but I understand UI frameworks for Ruby and Python are full-featured.
If a port to the web is possible, that would make it cross-platform and maintainable for quite a while.
I have not used Frontier, I do not know the full feature set, nor the architecture. I do agree with the value of making it easier for the average user to customize their software.
I am looking at OPML Editor v10.1b21for OS X (my OS X version is El Capitan). Once I launch OPML I the File Open Dialog, but there is no file to open. Once I close the File Open Dialog there is not much I can do. File -> New does not do anything, there is no window to enter anything, and the only thing I can do is Quit the application. That is also true for all the other version of OPML that I tried.
32 Bit apps will no longer run on newer OSX/macOS versions, as the 32 bit RunTime is deprecated. Getting the "not optimized" warning on launch. You probably know this, but login issue.