Finance and Accounting

Accounting software

 * Exact
 * Peachtree
 * QuickBooks (.qbo, .qbw)
 * M.Y.O.B.

Document digitization or organization

 * Lemon (app/website tracking cards and receipts)
 * NeatReceipts

Interchange formats: open

 * GnuCash XML Format
 * OFX
 * Plain text accounting journal (a family of formats used by Ledger and "Ledger-likes")
 * QIF
 * Tax XML (used by various governmental entities for e-filing)
 * TXF (Tax Interchange Format; used by TurboTax)

Interchange formats: proprietary

 * BACS Standard 18
 * QFX

Market data

 * ITCH (NASDAQ)

Personal finance software

 * Banktivity
 * Budget (Apple II)
 * GnuCash
 * Microsoft Money
 * MoneyTree
 * Quicken (Creates .qdf, .qph, .qel, .qsd, Imports .qif, .qfx)

Tax software

 * H&R Block (.t11, etc.; changes every year)
 * TurboTax (.tax, .tax2010, etc.; changes every year)

Naming and numbering systems

 * Routing transit number

Links

 * HMRC to sell taxpayers' financial data
 * Info on Federal Reserve download data