If you want a full-featured desktop app with a lot of data transformation abilities, Hammer is worth a look. This offline-capable tool has more than 40 functions, including hash calculations (MD5, SHA1, SHA256, SHA512), Base64 encoding and decoding, encryption and decryption, and more. It also has hotkeys for productivity and works on multiple machines with lifetime updates, making it a useful and secure option for your data transformation needs.
If you're looking for something more data engineering oriented, TABLUM.IO is a data ingestion SaaS tool that transforms raw data into analytics-ready SQL tables. It can handle many formats and can connect to Business Intelligence tools and Data Visualization apps with a single ClickHouse DB connector. It solves some common data engineering problems by providing a streamlined way to import and prepare data from many sources, so it's good for people who need more data transformation and integration abilities.