Additional hledger tools you can install with stack or cabal. Once installed, these will appear in hledger's commands list:

hledger-diff shows differences in an account's transactions between one journal file and another.

hledger-iadd is a terminal UI replacement for hledger's add command.

hledger-interest generates interest transactions for an account according to various schemes.

hledger-irr calculates the internal rate of return of an investment account.

More tools:

hledger-check-fancyassertions.hs checks more powerful account balance assertions.

ledger-autosync can download, deduplicate and/or convert OFX data (includes hledger support, rename/symlink it to hledger-autosync to see it in commands list)

plaintextaccounting: related tools - all known plain text accounting helper tools