Economic Development: these are webpages from institutions related with development projects either at a national or individual levels.

Mathematics: Math without tears; these pages teach it in a simple way

• CREART (in Spanish): CREART is an NGO working towards the improvement of kids' education and standards of living
• The Hunger Site: "The Hunger Site is the world's first "click-to-donate" site where more than 88 million visitors have donated more than 10,000 metric tons of free food to help feed the hungry. They have done this by visiting The Hunger Site daily and simply clicking a button. The donations of staple food, paid for by The Hunger Site's sponsors, are distributed to the world's hunger hot-spots by the United Nations World Food Programme." (extracted from The Hunger Site)
• Grameen Bank: the Grameen Bank is an institution created in Bangladesh to make loans without collateral to poor women in that country. Despite the fact that they are giving credit to the poorest among the poorest of a poor country, the on-time loan repayments exceed 98%.
• MSF: MSF is an independent humanitarian medical aid agency committed to two objectives: providing medical aid wherever it is needed, regardless of race, religion, politics or sex and raising awareness of the plight of the people we help.
• Intermon (in Spanish): this institution was created in 1956 to fight poverty in poor countries by providing them with the means to generate development by themselves.
• Amnesty International: AI is a worldwide campaigning movement that works to promote all the human rights enshrined in the Universal Declaration of Human Rights and other international standards. In particular, AI campaigns to free all prisoners of conscience; ensure fair and prompt trials for political prisoners; abolish the death penalty, torture and other cruel treatment of prisoners; end political killings and "disappearances"; and oppose human rights abuses by opposition groups.

• Elementary Mathematics (in Spanish): the objectives of this page are to facilitate the knowledge of basic math and to give the reader the possibility to continue learning by him/herself.
• The Mathematics of Mario (in Spanish): this page includes a review of the main concepts in mathematics as well as biografies of famous mathematicians and a brief history of mathematics. There you can find links to math pages in English.