Binary descriptions:

curl: command line tool for transferring data with URL syntax
curl-udeb: Get a file from an HTTP, HTTPS or FTP server
libcurl3: easy-to-use client-side URL transfer library (OpenSSL flavour)
libcurl3-dbg: debugging symbols for libcurl (OpenSSL, GnuTLS and NSS flavours)
libcurl3-gnutls: easy-to-use client-side URL transfer library (GnuTLS flavour)
libcurl3-nss: easy-to-use client-side URL transfer library (NSS flavour)
libcurl3-udeb: Multi-protocol file transfer library (OpenSSL)
libcurl4-doc: documentation for libcurl
libcurl4-gnutls-dev: development files and documentation for libcurl (GnuTLS flavour)
libcurl4-nss-dev: development files and documentation for libcurl (NSS flavour)
libcurl4-openssl-dev: development files and documentation for libcurl (OpenSSL flavour)

Last common version:

7.37.1-1ubuntu1