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This is in English.
After reading the site a bit, I thought I might post some highlights... (Most of it is also explained in sakeniwefu's link)
It seems to be mainly oriented to ARM and AVR and has an emulator running on x86, x86_64 and PowerPC. There is a Windows SDK which is mostly a bundle of some other tools (CodeLite, WinAVR, Sourcery G++, etc) modified and/or configured for easy installation. The Community Edition is just the source for the system and the configuration wizard. The full Windows SDK is priced at 249€ (fully refundable if not satisfied).
The kernel's got a cooperative round-robin scheduler, though a preemptive one is planned for the near future. It's got a stack process monitor, an interprocess messaging system, semaphores and signals. A bunch of libraries for various tasks (graphics, hashtables, compression, exceptions, etc) and drivers for some components (such as displays, storages, keyboards, motors, buzzers) are mostly stable, some in beta.
Supports FAT (FAT12 to FAT32) and Batt File System, and has a GUI library with a simple windowing system, menus, drawing some primitives, texts, bitmaps and simple charts.
Hello, I belong to the BeRTOS development team.
The English translation is almost done, but our web maintainer is on vacation right now :-)
The English version will be online when he will come back in just a few weeks.
In the meanwhile the documentation site (http://doc.bertos.org) and the developers' site (http://dev.bertos.org) are ready and available in English.
Also the shop (https://www.develer.com/shop/order) is translated, and if you want to try our Windows SDK here is the direct link: http://download.bertos.org/BeRTOS-SDK-setup.exe
Thanks for the info and the link, Thom!