I published an #IDA importer for the REShare #ReverseEngineering exchange format:

https://github.com/v-p-b/reshare-ida

I also wrote up my development experiences, incl. tips for IDA's type info API:

REshare Ramblings - Bad Vibes with IDA
https://scrapco.de/blog/reshare-ramblings-bad-vibes-with-ida.html

I'm still looking for contributors, esp. on the #radare2 and #BinaryNinja side!