Solar 2D (formerly Corona SDK) vs Clickteam Fusion 2.5

Corona SDK is completely free. That includes pro-tier plugins.

Corona SDK ships with Corona Simulator, which runs your game/app directly on your PC/Mac and updates every time you make changes.
It provides immediate feedback to your actions, you can see your changes right on the screen, without necessity to make build to device. Getting instant feedback really boosts tenfold prototyping and development speed.

It's easy to create a game that looks good on many different sized mobile devices.

With the live build feature, once you have created a build and installed on a device, you get lightning fast turnaround times because any change on the code or data is updated to the devices running the game (within the local WiFi) immediately. So changes can be tested on the real hardware within a very few seconds.
What's even more impressive, this even works flawless with multiple devices running the game. You have to use it to learn how good of a feature this is while development and even more, while doing QA. Imagine fixing bugs and everyone of your QA team/friends/whoever helps to get your game done, has all changes on his device without doing anything but waiting 5 seconds - outstanding.

Uses the great and easy-to-learn Lua programming language.

It's very quick to get things up and running with Corona SDK. The API is extensive and while it's not 100% feature-complete with the iOS API, it's close enough that you could create tons of games and never run into a roadblock.

The API docs can be found here.

Corona does not throw photoshop-like madness full of buttons editor. You can go as fast as you want, learning and building game from ground up. Eventually, you'll learn how much corona is doing for you. But to start you don't have to master complex editor software. It's a great tool to learn to start game development if you want to learn how to program and make games. Your experience will be 100% transferable to any other Pro game engine.

Corona works on OS X, Windows and Android (including Kindle Fire & Nook).

Since Corona SDK became Solar2D, it's completely free, as only some third-party plugins are paid.

Since Corona SDK became Solar2D, it's completely open source under MIT license.

With the Developer edition of the product, there are absolutely no limits or requirements when selling your creations. You are free to make as much money as you want (this applies to the Standard edition too), and you don't have to include any logos or credits in your creations.

If you buy Fusion 2.5, and later decide you want to upgrade to the Developer version, or in the case of moving from MMF2 to F2.5, the company offers upgrade discounts.

Be it Windows EXE, Android APK, iOS, HTML5 and Flash SWF, Fusion 2.5 is able to export your game to fast, truly native runtime for specified platform with a click.

CF2.5 uses a straightforward drag & drop editor that allows for easy level, animation and event creation without having to write a single line of code.

Dedicated Bug tracking system linked to user forum for ease of access.

A free version is available for download here.

CF allows creating Windows applications. Additionally, due to hundreds of available extensions, the process is quick.

Clickteam Fusion 2.5 brings to you the box2D physics engine.

Click Fusion has a great selection of extensions submitted by the community.

The extensions cover a variety of game-building tasks including parsing of strings using up to two alternating delimiters using the "Tokenizer Object", generating random numbers without reusing them from multiple lists which can be refilled and distinctively replenished with the "Random Multipool Object" among others.

This software has been around since 1994 (then called Klik & Play) and is still going very strong. Also, one of the founders of Clickteam was the developer of STOS BASIC and AMOS BASIC for the Atari ST and Amiga computers.

A great community in Spanish where you will receive all the help you need to solve your doubts and problems. You'll also find all kinds of resources and materials in Spanish.

Una gran comunidad en español en donde recibirás toda la ayuda que necesites para solucionar tus dudas y problemas. También encontrarás todo tipo de recursos, tutoriales y ejemplos en español.

An excellent compromise between ease of use, power, flexibility and ability to export to different platforms. Easy to learn for beginners with the ability to make complex things, of course, at the expense of a larger effort. Good rapid application development tool for making 2D games.

Any time you have a question or a problem, the community and the software developers are there to help you out either on forums or steam. The devs repond quickly to private messages or instantly on ClickConverse (chat). Additionally, many users have support sites with open source examples and tutorials.

Runs well under high object numbers, particularly on PC and iOS thanks to hardware acceleration.

Clickteam holds user conventions for customers to come along, meet the staff and hang out with people who they've met online. This furthers the community spirit which is so prevalent around Clickteam's products and it's a fantastic weekend.

There is no 'easy button' program that will make a good game for you with no hard work, and this software is no exception to that, but it does make the process easier. With the option of coding in either a spreadsheet style editor or a list style editor, the event based programming language reads more like English than traditional programming languages. This has made it ideal for me as I have a very hard time understanding traditional programming. I would say this is the perfect solution for people that want to make 2D games but who don't have a very mathematically oriented mind, and think more visually. Just like anything it can take some getting used to, but after following some tutorials and tinkering with it, you'll be able to create practically any kind of 2D game with it so long as you have the determination.

Such as tools, utilities, multimedia projects, etc.

Have used fusion 2.5 through all of its iterations, even when it was owned by imsi as CNC ( click n create ) it has been very stable and projects have been known to run on almost any Windows based computer. The projects you create even run on future versions of Windows with never many issues.