Many of the resources below are free or very low cost, and are sure to be useful to a lot of designers and developers out there.
As always, if we've missed something you think should have been included, please let us know in the comments. And if you have an app or other resource you'd like to see included next month, tweet it to @cameron_chapman for consideration.
Folding Text is a plain text productivity app made for geeks. It automatically formats your text, and gives you the ability to view the big picture or just the details.
WorkFlowy is a note-taking and organization app. It mimics the way you think, allowing you to organize virtually anything you need to keep track of.
ThetaBoard is a real-time project management app for teams. There are free personal plans available, or you can sign up for a premium account.
GroupDocs is a document management app for collaboration, sharing, and working with documents online. It makes it easy to organize, view, annotate, sign, and otherwise work with documents.
LazyMeter is a to-do list app that makes it easier for you to focus on a daily goal and stop feeling lazy.
Magisto is a free video editing app for iOS and Android that automatically edits your plain videos into beautiful movies. Shoot a video directly within Magisto or select clips from the gallery.
Haiku Deck is a presentation app for the iPad that lets you easily create beautiful slideshows to share. It includes a range of fonts, layouts, and image filters, as well as millions of free, high-quality photos.
AutoText is a typing assistant that works with any software, similar to Text Expander. Just assign acronyms to your frequently used text snippets and AutoText will auto-type it for you.
Plunk, from Zurb, is a new mobile testing app that lets you run click tests on images from your mobile device. It's free and to use.
Bourbon is a lightweight mixin library for Sass. It's simple and easy to use with no configuration required.
Clearless is a collection of reusable LESS mixins, which aim to provide flexible, configurable solutions to problems addressed by the library.
Kube is a CSS framework for developers. It's adaptive and responsive, with a built-in grid and beautiful typography, but with no imposed styles and complete freedom.
Responsive Measure is a jQuery plugin that lets you pass in a selector that generates the ideal font size.
Base is a responsive framework for mobile devices, tablets, netbooks, and desktop computers. It keeps accessibility in mind and is easy to learn.
Mobile Mozaic is a gallery of well-designed iPhone applications. You can view designs by category, UI pattern, and more.
Codiad is a cloud-based IDE framework with minimal requirements and a small footprint. It's still in development but has so far proven extremely stable.
Tooltipster is a jQuery plugin that makes it easy to create HTML5-validated tooltips. It's easily styled with CSS, without images, and plays nicely with IE.
Jarallax is an open-source JS library that makes it easy to create CSS interactions, including parallax scrolling.
floatShare is a jQuery floating social sharing plugin that's easy to customize and integrate into your website.
CSS Horus is a responsive CSS framework for developing cross-browser supported websites. It has 16-grid columns plus basic style formats, including resets, typography, and more.
HTML5 Blank is a blank HTML5 WordPress theme that's responsive ready and includes preloaded functions, HTML5 Boilerplate reset, and a media query framework.
How do they make money?
This site shows how popular websites, everything from Evernote to Facebook to Tumblr, make money. It breaks down revenue streams into advertising, subscribers, lead generation/affiliates, selling data, freemium, and royalties.
Modest Maps is a small, free library for integrating interactive maps into your projects. It includes well-designed, tested code, with thousands of maps already using the toolkit.
Brunch is an HTML5 application builder that's agnostic to frameworks, libraries, programming, and more. It watches your files for changes and automatically wraps your scripts and templates in common.js modules.
Paydirt is a free, easy invoice creator. Just enter your info and then save it, print it, or download it as a PDF.
Uninvited Redesigns is a gallery of proposed site redesigns created by various designers from all over the web. You can view the redesigns or submit your own.
Dooodleista Type (free)
Dooodleista Type is a free hand-written font, reminiscent of a good doodle.
Bondilera is a free display font with an oldfashioned signage feel.
Nue is a great font for display titles, with a simple and delicate style. It comes in three weights, and was designed by Julia Martinez Diana.
Bello Complete ($120)
Bello Complete is a brush typeface that comes in two styles: small caps and script.
Lorimer No 2 ($600)
Lorimer No 2 is a sans serif type family designed for display use, designed by James Puckett.
Hernandez is a bold, slab-serif display typeface designed by Daniel Hernandez, with a large number of contextual and stylistic alternates.
Diamonds is an experimental typeface that incorporates geometric new letterforms which are easy to read but unexpected.
Hipster Script ($79)
Hipster Script is a brush script that includes swashes, alternates, and ligatures. It includes two extreme widths that remain faithful to hand movement subtleties.
Sundowners is a simple and versatile font that includes some cool interlocking glyphs and a handful of amusing initial and terminal forms.
Lexia is a slab serif font family with twelve weights and styles. It includes subtly curved serifs and open character shapes.
Did we forget something you think should have been included? Let us know in the comments below.