OpenWIG 0.2.2 is out.
In addition to task support, it can now work with practically any cartridge code - although most cartridges will be unplayable anyway, because of missing functionality. See what is implemented and how to install your cartridge.
Since 0.2.1, it is possible to choose between manual input of coordinates and Bluetooth GPS device.
Misch's gwc decoder appears to be functionally complete, so it is just a matter of time when OpenWIG will be able to open and play cartridges compiled by official tools.