The DgTiny24 sports two Grove connectors, and is quite interesting when you need to develop a special device with an I2C and/or another functionality compatible with Grove cables.
ATtinys 24,44,84 have 12 I/O including the reset line with limited functionality. The two I2C lines of the Grove I2C connector, compatible with USI library are already connected with 2 kOhm pull-ups. The second Grove connector can be wired on any pin.
An ATtiny24 SO14 package is installed. It is programmed via a single in line 1.25mm pitch connector. The connector is supplied, but if if you just need to update the software on the board, the 6 holes do not need a connector. The programming cable adaptor has a 6-pin male connector; insert partly, press on side and do not move for the few seconds of
programming time. Hundreds of boards have been programmed this way. For the development prototype, it is of course convenient to solder the compatible Molex connector. An adapter and cable is provided with the kit to be compatible with the less convenient 2x3 pins AVR-ISP traditional connector.