Hello everybody !
Here are some sites I used in the past or I`m using right now and I thought it might be useful for some of you.
" AlternativeTo is a new approach to finding good software. Tell us what application you want to replace and we give you great alternatives, based on user recommendations. " 
This site provides a One-Click solution that looks at your computer's hardware and system software to determine whether or not your current system can run a product. Each of your computer's components is evaluated to see how well it meets the minimum and recommended requirements for specific products. Recommendations are made on how to update or upgrade each component which does not meet the listed requirements. Sometimes, a simple, free software download is all that is needed. Sometimes you'll find that you need a different video card to fully experience what the game has to offer.
This sites provide in one installer some programs you might don`t want to search losing time.
That`s something similar with Noisli but here you can mix your own pieces or edit some existing ones.
Listen to relaxing music, ambient atmospheres and astonishing sound effects.Every audio template can be easily edited for your own needs. Here is a short video explaining some of our features.
Improve focus and boost your productivity.
Mix different sounds and create your perfect environment.
So here is a site that can solve simple or more complex algebra ecuations.
