C2FO/fast-csv

Full featured CSV parser with simple api and tested against large datasets.

Fast and powerful CSV (delimited text) parser that gracefully handles large files and malformed input

CSV data manipulation made easy in PHP

World's Fastest .NET CSV Parser. Modern, minimal, fast, zero allocation, reading and writing of separated values (`csv`, `tsv` etc.). Cross-platform, trimmable and AOT/NativeAOT compatible with blazing fast SIMD vectorized parsing.

CleverCSV is a Python package for handling messy CSV files. It provides a drop-in replacement for the builtin CSV module with improved dialect detection, and comes with a handy command line application for working with CSV files.

Fastest end-to-end CSV ingestion for Ruby (with C acceleration). SmarterCSV auto-detects formats, applies smart defaults, and returns Rails-ready hashes for seamless use with ActiveRecord, Sidekiq, parallel jobs, and S3 pipelines — even for messy user-uploaded real-world data.

Library to help reading and writing CSV files

Decode mime formatted e-mails

Read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way