When comparing FlashDevelop vs UltraEdit, the Slant community recommends UltraEdit for most people. In the question“What are the best programming text editors?” UltraEdit is ranked 33rd while FlashDevelop is ranked 41st. The most important reason people chose UltraEdit is:
UltraEdit has small memory usage and allows for fast parsing/searching when handling large files.
Specs
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Pros
Pro Free
FlashDevelop comes without any cost.
Pro Haxe development support
FlashDevelop has first-class support for Haxe development, the open source toolkit based on a modern programming language and cross-platform library.
Pro Good code completion
FlashDevelop's code completion is pretty good.
Pro Excellent support for Actionscript 2 and 3 (Flash)
Although everyone claims Flash is dead, it's still quite useful for game developers due to its rapid compile and run times, as well as its great debugging functionality with FlashDevelop.
Pro Good number of project templates
While it's project template system is not the best compared to it's competitors, it still is decent and is a good way to generate some boilerplate code.
Pro XML/HTML completion
FlashDevelop has XML/HTML completion aside from code completion.
Pro .NET Framework 2.0 application
It's windows only, but has tremendous support from plugin developers and a dedicated team that's been developing it for close to 10 years.
Pro Source-control support (svn, git, mercurial)
Pro Great debugging
FlashDevelop provides very efficient debugging features.
Pro Supports Zen-coding for HTML
This is very useful for carrying out high-speed HTML coding and editing.
Pro Snippets
Pro Tasks/todo
Pro SWF/SWC exploration
Pro Great project compilation
FlashDevelop facilitates project compilation.
Pro Decent code generation
Although the code generation can't really be called top-notch, it's decent and sufficient for most developers.
Pro Handles large files (>1GB) extremely well
UltraEdit has small memory usage and allows for fast parsing/searching when handling large files.
Pro Works perfectly with remote files
Supports several protocols for accessing remote files and working on them with the same ease as local files. Files can be integrated in the projects as normal files.
Pro Probably the most versatile general editor in existence.
If you need a general editor, UltraEdit is the way to go. If you were writing C/C++ all day, then this would be your editor. If you need to slog through large files then this is your go to editor. If you need to go through XML files, then this is your editor. If you need to sort data, then this your my editor.
Pro Fast, stable, easy to use
It loads with a short delay, but once loaded it's snappy and rock-solid. Anyone accustomed to using Windows text editors will feel at home in its interface, and those that prefer alternate keybindings can easily change them.
Pro Search and replace capabilities
From Ultraedit to Perl to Unix regex engines, the search and replace can accomplish just about anything.
Pro Responsive company
Whether for feature requests, technical support or license questions, IDM is always quick to respond.
Pro Nice hex display & edit
There's a handful of other features like this that make UltraEdit indispensable.
Pro Extremely customizable GUI editor
UltraEdit offer the best of both worlds. it has a full on GUI along with all the shortcut commands you need. There's no need for the user to suffer 80 char limitations of a terminal editor.
Pro Highly flexible
UltraEdit allows you to handle groups of files as a project.
Cons
Con Windows only
FlashDevelop is for Windows only, and it's not cross-platform either.
Con Haxe debugging is in its infancy
Although FlashDevelop supports breakpoint debugging on Flashplayers, native Haxe applications (C++) can't be easily debugged within FlashDevelop.
Con Proprietary
It's not free and a license costs $79.99.
Con The themes introduced in version 20 regressed certain aspects of syntax coloring
The themes simplified the syntax highlighting which lost the capacity to have as many colors as one wanted to define. Now it is limited to around 20 different colors. In general it's not a problem but in certain cases it broke coloring.
For some reason, the classic theme is the only one that is totally pleasant for readability well with syntax highlighting.