Alternatives to Fast Sum for all platforms with any license

HashCheck Shell Extension

File-integrity verification with CRC-32, MD5, SHA-1, SHA-2 and SHA-3, integrated into Windows file-properties dialog box.

Free Open Source Windows Windows Explorer
Shell integration Windows Explorer extension Add a feature

119 Like
- Discontinued Last commit is 2016.
Hashtab

Fast and Simple. Users in over 200 countries have downloaded HashTab to use as a simple MD5 checker or for a more advanced file integrity check.

Free Personal Mac Windows Windows Explorer Finder
Bulk Hashing Shell integration Add a feature

66 Like
HashMyFiles

HashMyFiles is small utility that allows you to calculate the MD5 and SHA1 hashes of one or more files in your system.

Free Windows
Portable Add a feature

16 Like
- Discontinued The program is no longer updated. Last version, 3.3, released in 2007, can be still downloaded from the official website.
CHK Checksum Utility

CHK is an advanced checksum utility — a simple application designed to help you verify the integrity of your files, find duplicates and much more!.

Free Windows
Duplicate File Finder Portable SHA256 SHA512 Add a feature

4 Like
MD5 & SHA Checksum Utility

MD5 & SHA Checksum Utility is a tool that allows you to generate CRC32, MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of single or multiple files. You can also...

Freemium Windows
Drag n drop Windows Explorer integration Add a feature

2 Like
FileVerifier++

FileVerifier++ is a Windows application for verifying the integrity of files. FileVerifier supports various algorithms by means of dynamically loadable hash libraries....

Free Open Source Windows
Drag n drop Portable Shell integration Add a feature

10 Like
- Discontinued The project is no longer developed. Last version, 0.6.3.5830, released in May 2010, can be still downloaded from SourceForge.
Hash Generator and Validation Tool

It supports many types of hashes, including CRC (any), HAVAL, MD5, MD6, SHA-2, SHA-3, Tiger, Whirlpool, etc.

Free Open Source Windows Linux
No features added Add a feature

3 Like
dsSHA

dsSHA is a SHA1 hash-calculator. The beauty of this is its simplicity, tiny size (7KB) and ease of use. There is no interface: just drag and drop a file on to this...

Free Windows
Portable Add a feature

1 Like
- Discontinued The program is no longer updated. Last version, 1.0.2, released in 2004, can be still downloaded from the official website.
dsMD5

dsMD5 is a MD5 hash-calculator. The beauty of this is its simplicity, tiny size (6KB) and ease of use. There is no interface: just drag and drop a file on to this...

Free Windows
Drag n drop Portable Add a feature

1 Like
- Discontinued The program is no longer updated. Last version, 1.0.2, released in 2004, can be still downloaded from the official website.