scripts/opentxs            This is the command line utility.

Try:  opentxs list
Also: opentxs help
And:  opentxs stat

The entire regular OT API is fully accessible from within the ot scripts.
For more on that, see:
https://github.com/FellowTraveler/Open-Transactions/wiki/Use_Cases
https://github.com/FellowTraveler/Open-Transactions/wiki/API

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scripts/ot                 This is the high-level OT API. (In script form.)

There are "SCRIPT HEADERS" which OT automatically includes in every script.
These are in the scripts/ot folder. These form an "Ultra-High Level" wrapper
to the OT API, in the OT script language (chaiscript.)

scripts/ot/ot_commands.ot  The code for each individual opentxs command is here.
scripts/ot/ot_made_easy.ot High-level interface for sending server requests.
scripts/ot/otapi.ot        Used by ot_made_easy. Corresponds to Java OTAPI_Func.
scripts/ot/ot_utility.ot   Used by otapi. Handles low-level OTAPI calls for you.

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scripts/tests              This folder contains test scripts.
scripts/tests/test_ot      This is the main "test script" for OT (in bash.)

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scripts/util               Various utility scripts, such as the resync script.

Note: resync is for development and testing. You should never actually
need to resync from the server in real-world situations, since you must
trust the server in order to do this.

See also adjust_usage.ot which can be used for viewing or adjusting the
usage credits that a specific Nym has on a specific OT server.

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scripts/smartcontracts     
scripts/smartcontracts/smartcontract.ot
scripts/smartcontracts/escrow
scripts/smartcontracts/two_way_trade

See the new script:   smartcontract.ot

smartcontract.ot is a utility for viewing and constructing smart
contracts. You can paste the sample smart contracts, escrow.otc and
trade.otc, into this utility, in order to browse them from its menu-
based interface.

If you start smartcontract.ot without any input, then it creates
a new, blank smart contract.

See the (working) examples, escrow-with-arbitar and two-way-trade.
There are also videos for these.

Once you create a template for a smart contract, you can use it over
and over again for different Nyms and different accounts.

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NOTE: do NOT use the tool: 'ot' -- it's too low-level for users.
Instead, use the opentxs utility, which is a script.
(ot is the engine used to run the opentxs script.)

Try:  opentxs list
Also: opentxs help
And:  opentxs stat