Well, the more the merrier. Apart from the web interface, it doesn't seem to be quite as full-featured (eg, no typed metadata), but I may try out one of these days.

I'd like to note that ledger's manual is second to none. More documentation like this, please.

hledger author here. It is a bit less featureful than Ledger, partly by necessity (it's younger, I'm slower) and partly by design. My priorities are slightly different from John's.

That said, hledger does have features Ledger doesn't (aside from being a haskell project, which I see as a significant long-term feature). Some of hledger's experiments have found their way back into Ledger, also.

Also by design, hledger is very compatible with a subset of Ledger, so that you can keep journal files that work with both.

As I said above, I welcome more software like this, it's a very nice trend (I noticed Python and Perl implementations as well).