https://github.com/dcwbrown/dwire-debug
Simple stand-alone debugger for ATtiny 45 and other DebugWIRE chips connected directly to an FT232R or similar on Linux or Windows.
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GPLv2
Windows 8.1 10 plus Cygwin and MinGW, Ubuntu 15.04
USB UARTs are FT232R and CH340 or a tiny85 (Digispark / Little Wire); CP210x is non-functional with PL2303 as unknown TBD.
(PL2303 in https://www.avrfreaks.net/forum/debugwire-usb-uart#comment-2279346)
https://github.com/dcwbrown/dwire-debug#cross-platform
http://digistump.com/products/1 (Digispark USB Development Board)
http://littlewire.github.io/ (Little Wire)
Edits : PL2303, strikethru, DigiSpark