IOTA Wallet 2.5.7 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the free program is IOTA Foundation.
IOTA Wallet lies within Business Tools, more precisely Finances. We recommend checking the downloaded files with any free antivirus. The most popular version among IOTA Wallet users is 2.5. The most frequent installation filename for the program is: IOTA Wallet.exe. You can execute this free PC software on Windows 7/10/8/11 64-bit.
From the developer:
IOTA is a next generation public distributed ledger that utilizes a “Tangle”, at its core. The Tangle is a new data structure based on a Directed Acyclic Graph; it has no Blocks, no Chain, and also no Miners. Since there are no miners, each participant in the network that wants to make a transaction has to actively participate in the consensus of the network by approving 2 past transactions.
You may want to check out more software, such as Windows 10 IoT Core Dashboard, Namecoin Online Wallet or Online ppcoin Wallet, which might be related to IOTA Wallet.