Industria is a collection of portable R6RS Scheme libraries for cryptography (AES, HMAC, SHA-1, SHA-2, RSA, DSA, ECDSA, etc.), zlib/xz decompression, disassemblers for various machine architectures, Off-The-Record messaging, bytevector pack/unpack syntax, TLS connections via custom binary ports, Secure Shell, and a few more things.
It can be cloned with git from https://github.com/weinholt/industria/.
There are release tarballs available.
Industria is available under the MIT license. See the file LICENSE.txt for details.