Have a look at TextQ (disclaimer - I'm its developer). It can import a big CSV file and allows you to manage its schema/structure - e.g. rename or hide columns, parse dates and numbers, and index columns;
TextQ supports SQL queries using SQLite syntax. You can select, join, group by, etc.
For less technical users, TextQ offers UI Query Builder, which can ...
You should check out TextQ (disclaimer - I'm its developer). It can import a big CSV file and manage its schema/structure:
parse dates and numbers;
index columns to speed up search;
You can filter rows with a UI Query Builder.
For more advanced users, TextQ supports SQL. You can select, join, group by, etc. The UI Query Builder can ...
Try Kmplot. Used it myself.
KmPlot is a mathematical function plotter for the KDE Desktop. It has a powerful built-in parser. The graphs can be colorized and the view is scalable, so that you are able to zoom to the level you need. Users can plot different functions simultaneously and combine them to build new functions. It also provides ...