Who writes the purchase contract if I buy without a buyer's agent?
Usually the listing agent prepares the purchase agreement on your state's standard forms using the terms you sent, and you review and sign it. In some states an attorney handles contracts. ListingCraft for Buyers sends your terms as an offer package and lets you sign the contract and amendments in your deal room.
Remember that the listing agent represents the seller. It is common for direct buyers to have a real estate attorney review the contract before signing, and ListingCraft is not a brokerage and does not give legal advice.