| C.R.D.P. de Lille | fr | Math exams |
| Cabri Geometrie | sp | Archives of math programs and training math programs |
| Cabri Java project | fr,en | Sites offering various training techniques |
| Cabri | sp | Mathematics software |
| Cabri-Geometre | pt | Mathematics software |
| Calaix + ie | sp | Sites offering various training techniques |
| Calc 3D es un programa para calcular vectores tridimensionales, matrices y nÑŠmeros complejos | sp | Sites with math tools |
| Calc 3D | de | Sites with math tools |
| Calc3D, a free vector, matrices, complex and quaternion number calculator | en | Sites with math tools |
| Calcolo Combinatorio | it | Methodical materials |
| CalCul | de | Sites with math tools |
| calculator.org - Flow Simulation Ltd. | en | Reviews of training programs in math |
| Calculatrice de fonction | fr | Sites offering various training techniques |
| Calculaweb | sp | Sites with math tools |
| Calculus graphics [Douglas N. Arnold, Penn State] | en | Sites offering various training techniques |
| Calculus graphics -- Douglas N. Arnold | en | Sites with math lessons |
| Calculu's | pt | Educational portals |
| California Mathematics Council Community Colleges-South | en | Teacher-oriented sites |
| California Mathematics Council Community Colleges-South | en | Teachers' associations |
| California Mathematics Council, Community Colleges | en | Teacher-oriented sites |
| California Mathematics Council, Community Colleges | en | Teachers' associations |
| California Mathematics Council | en | Teacher-oriented sites |
| California Mathematics Council | en | Teachers' associations |
| CALM | en | Mathematics software |
| CALMAT | en | Mathematics software |
| Calmat | en | Mathematics software |
| Camel | fr,en | Mathematical societies |
| CAMEL | fr | Mathematical societies |
| Canada's SchoolNet: Learning Resources | en | Education-related sites |
| Canadian Mathematical Society [CMS] | en | Math servers (ftp and gopher) |
| Canadian Mathematical Olympiad | en,fr | Olympiads, competitions... |
| CANAL KIDS - Cultura - Matematica | pt | General educational sites |
| Candy Byte Software | en | Mathematics software |
| Carfim | fr | Mathematics software |
| Carl Friedrich Gauss | fr | History of mathematics |
| Carl Friedrich Gauss | pt | History of mathematics |
| Carlos Online Soluções para Matemática | pt | Sites offering various training techniques |
| Carnegie Learning | en | Sites with math lessons |
| Cartables.net | fr | General educational sites |
| Cartesio | it | Sites with math tools |
| CASIO FX-880P | sp | Sites with math tools |
| Castes, etres & nigmes | fr | Sites with math tests |
| CatEdu | en | Mathematics software |
| Caves Maths | en | Mathematics software |
| Cdmath | fr | Training math software on CD: publishers and sellers |
| CDR Soft 2002 | pt | Training math software on CD: publishers and sellers |
| Cellular Automata | en | Math libraries |
| Center after modern mathematician | ru | Mathematical societies |
| Center for Scientific Computing, Finland | fn | Math servers (ftp and gopher) |
| Center for Discrete Mathematics and Theoretical Computer Science | en | Math servers (ftp and gopher) |
| Center for Instructional Technology | en | Teacher-oriented sites |
| Center for Instructional Technology | en | Teachers' associations |
| Center for the Study of Technology and Society: Education | en | Education-related sites |
| Central Illinois Teacher Exchange (CITE) | en | Education-related sites |
| Centre de Mathématiques- Ecole Polytechnique (France) | fr | Mathematical societies |
| Centre de Recherche et d'Expérimentation sur l'Enseignement des Mathématiques. | fr | Teachers' associations |
| Centre for Experimental and Constructive Mathematics | fr | Mathematical societies |
| Centre for Innovation in Mathematics Teaching | en | Education-related sites |
| Centre International de Rencontres Mathématiques | fr | Mathematical societies |
| Century live - century study | ru | Others links |
| Chamois | fr | Sites with math tools |
| Championnat International des Jeux Mathematiques et Logiques | fr | Olympiads, competitions... |
| Championnats des jeux mathématiques et logiques | fr | Sites with math tests |
| CHANCE | en | Sites offering various training techniques |
| Chaos and nonlinear dynamics | en | Math libraries |
| Chaos and nonlinear dynamics | en | Math libraries |
| Chaos at AIP | en | Math servers (ftp and gopher) |
| ChatBleu : Voir pour Comprendre | fr | Sites offering various training techniques |
| Cheat Defeat | en | Sites with math tools |
| Childrens Mathematics | en | Educational portals |
| Chinese Numbers | en | Mathematics lexicon |
| CHIP Publications | en | Mathematics software |
| Chronologie, Tableur ... par Serge et Zora MEHL | fr | History of mathematics |
| CIENTEC: matematica | sp | General educational sites |
| circo | sp | History of mathematics |
| CIRM library | fr | Math servers (ftp and gopher) |
| Cisco's Virtual Schoolhouse | en | Education-related sites |
| CLAME - Comité Latinoamericano de Matemática Educativa | is | Teacher-oriented sites |
| CLAME - Comité Latinoamericano de Matemática Educativa | is | Teachers' associations |
| Clemson University | en | Math servers (ftp and gopher) |
| Cleveland State University | en | Math servers (ftp and gopher) |
| CLIC | fr | Mathematics software |
| CLK-Calculator | de | Mathematics software |
| Club Amigos de la Matematica -- Universidad de Antioquia | sp | Educational portals |
| Clube de Matematica | pt | Personal mathematics home pages |
| Clube de Matematica | pt | Personal mathematics home pages |
| Clube Virtual da Matematica | pt | Personal mathematics home pages |
| CLUESOFT GNMAC | de | Mathematics software |
| CMS Competitions - Concours de la SMC | en,fr | Olympiads, competitions... |
| Colegio de Gaia - Grupo de Matematica | pt | Small selections of links |
| Collaborative Lesson Archive | en | Didactics |
| Collectanea Mathematica | sp | Mathematical journals |
| Collection of the links on sites with problems | ru | Olympiads, competitions... |
| College Mathematics Journal. [ISSN 0746-8342] Washington | en | Pedagogical journals |
| Color Mathematics | en | Mathematics software |
| Color Mathematics | en | Sites with math tools |
| Columbia University | en | Math servers (ftp and gopher) |
| Columbia University Mathematics/Science Library | en | Math libraries |
| Combinatorics | ru | Methodical materials |
| Community Learning Network (Canada) | en | Education-related sites |
| COM-PARTIDA DE MATEMATICA DEL URUGUAY | sp | Olympiads, competitions... |
| Competitions | en,fr | Olympiads, competitions... |
| Compito in classe di Matematica | it | Sites offering various training techniques |
| Completing the Square | en | Sites offering various training techniques |
| Complex Systems at AIP | en | Math servers (ftp and gopher) |
| Complex numbers | ru | Methodical materials |
| Composite function. The solution of equations and set of equationss keeping composite function | ru | Methodical materials |
| Computational Science Highlights | en | Math servers (ftp and gopher) |
| Computer Algebra Netherlands | nt | Math servers (ftp and gopher) |
| Computer Algebra in Mathematics Education | en | Teacher-oriented sites |
| Computer Algebra in Mathematics Education | en | Teachers' associations |
| Computer Algebra Netherlands | en | Math libraries |
| Computer Museum Guide: Software Reviews | en | Reviews of training programs in math |
| Computer Science and Mathematics | en | Math libraries |
| Computer Vision | en | Math servers (ftp and gopher) |
| Computers and the Humanities: Official Journal of The Association for Computers and the Humanities. [ISSN 0010-4817] Dordrecht, The Netherlands; Boston, MA: Kluwer Academic Publishers. | nt,en | Pedagogical journals |
| ComputerTest | en | Sites with math tools |
| Computing methods and programming | ru | Mathematical journals |
| Computing Teacher. [ISSN 0278-9175] Eugene, OR: International Council for Computing in Education | en | Pedagogical journals |
| Connections+ | en | Education-related sites |
| Connexions Mathématiques | fr | Math solutions |
| Construcciones...(Ðndice) | sp | Methodical materials |
| construction d'une figure | fr | Mathematics software |
| Continued Fractions... an introduction | en | Sites offering various training techniques |
| CONVERGE - Mathematics Educational Software for Algebra through Calculus | en | Sites with math tools |
| Conversations about mathematician and mathematicians | ru | History of mathematics |
| Coolmath.com - An amusement park of mathematics... and more! | en | Sites with math lessons |
| Coolmath.com - An amusement park of mathematics... and more | en | Sites offering various training techniques |
| Coolmath.com | en | Mathematics and … |
| Copernic | fr,en,sp,it,pt,de | Sites with math tools |
| Copernicus Education Gateway | en | Education-related sites |
| Core Knowledge - Lesson Plans | en | Didactics |
| CORNELL THEORY CENTER | en | Mathematical journals |
| Cornell University: Historical Math Monographs | en | History of mathematics |
| Corrado La Posta | it | Logics, paradoxes … |
| Corso di Trigonometria | it | Math theory |
| Council for Exceptional Children (CEC) | en | Teachers' associations |
| Count On | en | Math problems |
| Count On | en | Methodical materials |
| Count On | en | Pedagogical journals |
| Cours de Math | fr | Methodical materials |
| Cours de Math | fr | Sites with math tests |
| cours de math | fr | Sites offering various training techniques |
| Cours de mathématiques pour le collège | fr | Math solutions |
| Cours de Mathématiques | fr | Sites with math lessons |
| Cours et Exercices de Mathematiques | fr | Sites with math lessons |
| Courseware Solutions, Inc. | en | Mathematics software |
| CQuest Software | en | Sites with math tools |
| CRDP de Reims | fr | Math exams |
| Creative Technology | en | Mathematics software |
| Cristiano De Angelis | pt | Archives of math programs and training math programs |
| Cristiano De Angelis | pt | Math courses |
| CROC'Sciences | fr | Pedagogical journals |
| CRPC Internet Lesson Plans | en | Didactics |
| CSC Center for Scientific Computing, Finland | en | Guides and educational servers |
| CSC Mathematical Topics | en | Sites with information on math-related Internet resources |
| CTAN | de | TeX |
| CTAN | en | TeX |
| CTAN | en | TeX |
| CTAN | en | TeX |
| CTI Mathematics Home Page | en | Reviews of training programs in math |
| CTI Reviews of Mathematical Software | en | Reviews of training programs in math |
| Cuboc Kolmogorov | ru | Olympiads, competitions... |
| Cultivando a Matemática | pt | Sites with math tests |
| Cunningham Project | en | Math servers (ftp and gopher) |
| Curiosidades Matemáticas | sp | History of mathematics |
| Curiosidades Matemáticas | sp | Others mathematics sites |
| Curiosidades na Historia da Matematica | pt | History of mathematics |
| Curious and Useful Math | en | Others mathematics sites |
| Curious Math | en | Logics, paradoxes … |
| Curriculum Resource Center | en | Education-related sites |
| Curtin University | en | Math servers (ftp and gopher) |
| Cut the Knot: Interactive Mathematics Miscellany and Puzzles | en | Sites offering various training techniques |
| CyberEcoles : un site dйdiй aux projets TICE | fr | Educational portals |
| Cybermaths | fr | Sites with math tests |
| Cálculo Diferencial | pt | Texts and documents |
| CálculOnline | pt | Sites offering various training techniques |
| Cédécours | fr | Training math software on CD: publishers and sellers |
| Cуpiale | sp | Sites with math tools |
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