Are there any online or open source (i.e., free, or at least cheap) accounting systems that do multi-currency so that I can record revenues and payments made using BTCs in the same system that I use for USDs?
If not, are there any suggestions for how best to do this?
Just found Kashoo. Freemium, or $10/month. Haven't used it yet though.
Also, what might work, Aqilla:
Infinity PFM (Personal Finance Manager) can read transactions from the Bitcoin.org client: - http://launchpad.net/infinitypfm
Ledger:
Check out http://my-btc.info, a free page to monitor the portfolio of digital currencies with profit / loss calculation including BTC and many, many other alt-coins.
Diskussions about the tool at the bitcointalk forum: https://bitcointalk.org/index.php?topic=220238.0
Also, I must say that Dario (the webmaster) is a great guy. Unbelievable what has been implemented in the last two months and he is always open to new suggestions. Thanks and Greetings
Another option is Xero accounting: http://www.xero.com/
It's free(gratis) with an extensive API so you could add BTC transactions if you're programmatically-inclined and supports multiple currencies.
EDIT: Maybe it's not so free
Yes, check out Bitcoin Transaction Coordinator for NetSuite. http://www.btc4erp.com. And there is a free offer to work with NetSuite if you are a startup.
It also has built in pricing for Bitcoin exchange rates and will seamless allow accepting Bitcoin and paying bills. It appears to be the first fully integrated platform.
Consider using https://www.blockonomics.co. It only supports BTC, they have plans to support more crypto later
You can track multiple BTC address, see history and export transactions for further analysis.
CryptFolio supports multiple currencies and is designed for handling cryptocurrency inventory. The trial plan is free and the paid plans are, in my opinion, affordable.
Disclaimer: I'm the founder of CryptFolio.
