... ALE, and then there are TED, ...
I've got both ALE and T.ED. and T.ED is much better imho.
With it you can edit huger landscapes in realtime. Also the GUI and menus of T.ED are logical and filled with "nice to have" functions, whereas ALE is so poor on functions I get the feeling that the author just made the functions he was forced to do to make it a sell able product. (examples: Import export functions, terrain making/painting brushes shapes etc. Automatic rule-based coloring, "Sea level", "Ground level" etc.)
If I remember right I paid 40EUR for ALE and 25EUR for T.ED so I'll have to reconsider my old habit of buying the most expensive one to get the most quality.
Besides from now on I'll check the forums of different products before buying. On the T.ED forum you can see that the author (Dan i think he's called) is highly active with helping customers to get their programs to work. I don't event know if there are any ALE forums.
Don't get me wrong ALE still does its job and I used it for a while. But after I started using T.ED, ALE has paled so much I'd say it's like comparing Win3.11 to MacOSX or something like that. I'll never look back.