I am still doing a lot of work with development tools such as Articulate/PowerPoint, Captivate and most recently KSTutor, supplemented with standards such as GIMP and Kompozer.
In the line of this I have at various points had cause to look to add to my toolbox with some very nifty, but tiny micro apps. Here are three I am using at the moment:
GetColor SF: In essence a standalone version of the dropper tool offered by GIMP, Photoshop et al.
If you are working in PowerPoint you don't have the same luxury. GetColor offers a great way to get the hex value of any colour on the screen, and even save them for reference.
Arguably an essential addition to the PowerPoint learning designer's desktop.
Colour Contrast Analyser: Not sure if your imagery will meet accessibility requirements? This little app assesses contrast between colours. If you are working with the likes of Ufi you may know about this, but if you aren't, especially if you are doing your own SME-centred in-house development, this is a great way to get "free" accessibility.
This is a product of an Australian organisation called Vision Australia and a great example of an interest group that not only campaigns for equality but actually goes out there to make it easier for people to comply (overcoming inertia) after all - choosing colours wisely is essentially a 'free to implement' accessibility standard.
Sizer: A simple little tool that allows you to set the size of a window. With screen sizes now rapidly diversifying this allows you to choose to view at standard size, or to set your own sizes. Useful for viewing courses as your learners will see them, or for setting them prior to a capture session if you are using things like Captivate or KSTutor.