Frontent Editing allows the editors of an Umbraco 7 site to edit the site while browsing it.
A lot of effort is (or should be) put into customizing the editor experience in the backoffice of an Umbraco 7 site, like building custom property editors instead of fitting square pegs into round holes using the built-in property editors. To leverage these customizations, Frontent Editing simply loads the backoffice of the current page in an overlay and strips it from everything not related to the page itself.
Umport is a tool for synchronizing configuration settings between the different Umbraco environments in your project - from development through your various test environments and into production.
I built Umport because I was tired of the shortcomings of the existing, similar tools - the major one being the "import-and-hope-for-the-best" nature of these. Thus, Umport features an analyzer that lets you review your changes, before you import them.
If your preferred language for writing Umbraco views is XSLT, Umbraco 6 and specially Umbraco 7 presents you with new challenges, as the rendering engine of choice shifts more and more towards Razor.
One of the bigger challenges is figuring out what you can do with the current view model, since dumping it to XML is no longer a viable option. The Inspect package helps you achieve insight into the view model directly in your browser, while you're writing your view.
uCommerce is a brilliant e-commerce platform. Unfortunately it doesn't come with an automated deployment strategy out of the box, which eventually drove me to create uCommerce Sync.
uCommerce Sync lets you synchronize all uCommerce settings (and optionally stores and products) between the different environments in your project. Like uCommerce, the uCommerce Sync core is platform independant, and has been deployed in both Umbraco and Sitecore projects.
The cool people over at Imulus has built awesome property editor for Umbraco 7. In short it wraps all other property editors in "fieldsets", making it possible to build modular and responsive websites without sacrificing the great editor experience.
I've done a fair bit of contributions to Archetype (look for kjac), and I definitively plan to keep on helping out.