Hash Functions which are used and more popular

I know the list of all hash functions is too long. I just want to know the most popular ones which are used in day to day IT practical tasks. I know MD5, SHA1, SHA2 (256 and 512) are really popular. Is there any other hash function I can add to these 5 algorithms?

I want to develop a hash Tool and I just want to include those algorithms that developers really need.

Most widely used (and defined in standards for SSL/TLS, OpenPGP, SSH) are:

• CRC32 - simple checksum, used in ZIP, OpenPGP and number of other standards.
• MD2, MD5 - too old and weak MD5 - old and considered weak.
• SHA1 - standard de facto, used almost everywhere (DSA algorithm is used only with SHA1, that's also wide usage area).
• SHA224/256/384/512 - should supersede SHA1, and is used with DSA keys larger than 1024 bits, and ECDSA signatures
• RipeMD160 - used in OpenPGP, and some X.509 certificates.

There are also other hash algorithms (you can get the full list on wikipedia), but most likely you'll never meet them in real life.