What are some alternatives?
When comparing Altospam and Bitdefender Anti-Ransomware, you can also consider the following products
CryptoPrevent - CryptoPrevent is an Anti-Virus/Security Software Supplement, originally designed in late 2013.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
RansomFree - Protect your PC from ransomware with multiple detection methods.
Scrollout F1 - Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience.
Kaspersky Anti-Ransomware Tool for Business - A free software that offers complementary security to protect corporate users from ransomware.
AppCheck Anti-Ransomware - Protect your PC with 100% Signatureless Anti-Ransomware AppCheck