| S.A.E.M. Thales | sp | Teachers' associations |
| S.M.P.M. | sp | Teachers' associations |
| Sachse im Lдndle | de | Methodical materials |
| SAEM THALES | sp | Olympiads, competitions... |
| SamWeb [Dubussieux, Samuel] | fr | Sites with math tools |
| SamWeb | fr | Texts and documents |
| San Diego SuperComputer Center | en | Math servers (ftp and gopher) |
| Santa Fe Institute | en | Math libraries |
| Sapere.it | it | Encyclopaedia and musea |
| SASIAM | en | Math servers (ftp and gopher) |
| Saskatchewan Mathematics Teachers' Society | en | Teacher-oriented sites |
| Saskatchewan Mathematics Teachers' Society | en | Teachers' associations |
| School Library Resources on the Internet | en | Education-related sites |
| SCHOOL PAGE MATH | en | Links to math tools |
| School patterns | ru | General educational sites |
| School patterns | ru | Search engines and links guides |
| School patterns | ru | Guides and educational servers |
| School Projects that Connect with The Internet | en | Didactics |
| School quadrant of association. | ru | Others links |
| School Science and Mathematics Association | en | Teacher-oriented sites |
| School Science and Mathematics Association | en | Teachers' associations |
| School world | ru | Guides and educational servers |
| School, Science and Mathematics. [ISSN 0036-6803] Bowling Green, OH: School Science and Mathematics Association, Inc. | en | Pedagogical journals |
| Schoolbus Software | en | Mathematics software |
| Schools in the Internet | ru | Others links |
| Schoolzone Maths | en | Search engines and links guides |
| Schulmaterial - Arbeitsblätter für die Unterstufe | de | General educational sites |
| Schulmaterial - Arbeitsblдtter fьr die Unterstufe | de | Methodical materials |
| Schulzens - Grundschule,Beamtendarlehen,Hypotheken,Volleyball und Comedy | de | Methodical materials |
| Scidot: Logiciels pour la redaction pedagogique en mathematiques et sciences | fr | Sites with math tools |
| Science Museum | en | Encyclopaedia and musea |
| Scientific Computing and Mathematical Engineering | fr | Math servers (ftp and gopher) |
| Scientific Computing | de | Math servers (ftp and gopher) |
| Scientific engineering statistics and financial calculator resources | en | Reviews of training programs in math |
| Scite : Scienceware : Matematica | pt | Archives of math programs and training math programs |
| Scottish Mathematical Council | en | Teacher-oriented sites |
| Scottish Mathematical Council | en | Teachers' associations |
| Screening Oncologici | it | History of mathematics |
| Sector Matematica | sp | Archives of math programs and training math programs |
| Sector Matematica | sp | Directories with links to mathematics software |
| Sector Matematica | sp | Links to math tools |
| Selection of the radicals in trig equations | ru | Methodical materials |
| Selezione della Stampa - Pitagora: La matematica dell'armonia | it | Education-related sites |
| Sequences pedagogiques. Serveur de l'Academie de Toulouse. | fr | Mathematical societies |
| Sequences pedagogiques. Serveur de l'Academie de Toulouse. | fr | Texts and documents |
| Setting Up Your Classroom | en | Education-related sites |
| Several bibliographies | en | Math libraries |
| Shannon's Beginning Algebra Page | en | Math courses |
| Shelley's Mathematics Articles | en | Texts and documents |
| Sheppard Software - Algebra - One on One | en | Mathematics software |
| Sheppard Software - Brain Builder Math Edition | en | Sites with math tools |
| Shockwave | en | Mathematics software |
| Short Course on Complex numbers | en | Math courses |
| Short Trig Course | en | Math courses |
| SIAM | en | Computer magazines |
| SIGGRAPH | en | Math servers (ftp and gopher) |
| Sight2k | en | Sites with math tools |
| Signal Processing Information Base | en | Math libraries |
| Signal Processing Information Base | en | Math servers (ftp and gopher) |
| SimCalc Project | en | Didactics |
| SimCalc | en | Archives of math programs and training math programs |
| Simon Fraser University | en | Math servers (ftp and gopher) |
| Simon Fraser University's Electronic Library | en | Math libraries |
| SimpleTurtle Exams | en | Sites with math tools |
| SimplexNumerica | de | Sites with math tools |
| Simply Number Sense | en | Texts and documents |
| SIMTEL | en | Links to math tools |
| Sine and Other Trigonometric Functions | en | Sites with math tests |
| SINLOT - Sinusfunktionsplotter | de | Sites with math tools |
| Siproma Matematica Iberoamericana | sp | Mathematical journals |
| SIPROMA Matematica Iberoamericana | sp | Mathematical journals |
| SIPROMA. Matematica iberoamericana | sp | Mathematical journals |
| Siproma | sp | Mathematical journals |
| Sistema Informativo Nazionale Matematica | it | Sites with information on math-related Internet resources |
| Sistemas LIneares | pt | Methodical materials |
| Site d'Ambali | fr | Math courses |
| Site d'Ambali | fr | Math problems |
| Site d'Ambali | fr | Math solutions |
| Site de B.Brolis | fr | Personal mathematics home pages |
| Site de l'academie de Grenoble | fr | Math exams |
| Site de l'UDP | fr | Archives of math programs and training math programs |
| Site Keops | fr | Mathematics software |
| Site maths sciences de l'academie de Montpellier | fr | Math exams |
| Site maths sciences de l'academie de Rennes | fr | Math exams |
| Site maths sciences de l'academie de Rouen | fr | Math exams |
| Site maths sciences de l'academie de Strasbourg | fr | Math exams |
| Site Maths-Sciences de l'academie de Besancon | fr | Math exams |
| Site Maths-Sciences de l'academie de Creteil | fr | Math exams |
| Site Maths-Sciences de l'academie de Grenoble | fr | Math exams |
| Site Maths-Sciences de l'academie de Nancy-Metz | fr | Math exams |
| Site Maths-Sciences de l'academie de Nice | fr | Math exams |
| Site Maths-Sciences de l'academie de Reims | fr | Math exams |
| Site of elementary mathematics | ru | Methodical materials |
| Site of elementary mathematics | ru | Math exams |
| Site of elementary mathematics | ru | Methodical materials |
| Sites pédagogiques francophones | fr | Others links |
| Siti di Matematica | it,en | Others links |
| Siti di Matematica | it | Guides and educational servers |
| Siti WWW riguardanti la didattica della matematica | it | Education-related sites |
| Slates, Sliderules and Software - Teaching Math in America | en | Mathematics software |
| Smart | de | Texts and documents |
| SMART | de | Texts and documents |
| SmartLite Software | en | Sites with math tools |
| SmartMath.com | en | Mathematics software |
| Smf | fr | Mathematical societies |
| Socha's Interactive Math LInks | en | Education-related sites |
| Sociedad de Educación Matemática de la Región de Murcia | sp | Teachers' associations |
| Sociedad de Matematica de Chile | sp | Mathematical societies |
| SOCIEDAD MATEMATICA MEXICANA | sp | Mathematical societies |
| Sociedade Portuguesa de Matemàtica | pt | Mathematical societies |
| Societat d'Educació Matemàtica de la Comunitat Valenciana | sp | Teachers' associations |
| Society for Industrial and Applied Mathematics | en | Mathematical societies |
| Société Mathématique Suisse | fr | Mathematical societies |
| Softbasics Software | en | Mathematics software |
| SoftSearch | en | Search engines |
| Software & Information Industry Association | en | Reviews of training programs in math |
| Software aus der Thomasschule | de | Sites with math tools |
| Software di Matematica | it | Archives of math programs and training math programs |
| Software didattico multimediale per bambini ed handicappati | it | Training math software on CD: publishers and sellers |
| Software math | ru | Small selections of links |
| Solid Gold Gnarly Math | en | Educational portals |
| SOLO PARA FILOMATEMATICOS | sp | Education-related sites |
| Solve It Math Program | en | Mathematics software |
| Solvers On-line | ru | Math solutions |
| Solving algebra inequalities online | en | Math solutions |
| Solving algebra inequalities online | en | Sites offering various training techniques |
| Solving algebra inequalities online | en | Sites with math lessons |
| Solving Math Word Problems | en | Math problems |
| Some little-known facts from geometry of a triangle | ru | Numbers, functions, theorems … |
| Sources for Reviews of Educational CD-ROMs and Software | en | Reviews of training programs in math |
| South Carolina Council of Teachers of Mathematics | en | Teacher-oriented sites |
| South Carolina Council of Teachers of Mathematics | en | Teachers' associations |
| South Carolina SSI K-12 Lesson Plans for Math and Science | en | Didactics |
| soutien scolaire, collиge, lycйe | fr | Methodical materials |
| SPA Education Software | en | Archives of math programs and training math programs |
| Spanky Fractal Database | en | Math servers (ftp and gopher) |
| SparkNotes: Mathematics Study Guides | en | Math solutions |
| SparkNotes: Mathematics Study Guides | en | Sites with math lessons |
| Speed Math | en | Methodical materials |
| SpeedDrillMath | en | Mathematics software |
| Spinozistic Calculus | de | Sites with math tools |
| Spreadsheets in Education | de | Others links |
| Square trinomials and parameters | ru | Methodical materials |
| St. Olaf College | en | Math servers (ftp and gopher) |
| St. Petersburg School Olympiad on Mathematics | ru | Olympiads, competitions... |
| starQuiz | en | Sites with math tools |
| Startseite | de | Sites offering various training techniques |
| Statistical software for MS Excel | en | Sites with math tools |
| StatSoft - statistical jack house | ru | Mathematical societies |
| Steve's Math Page | en | Methodical materials |
| store.learningco.com | en | Training math software on CD: publishers and sellers |
| Storia del calcolo automatico | it | History of mathematics |
| Stroh MathPage | en | Math solutions |
| Student's mathematical olympiads | ru | Olympiads, competitions... |
| StudyWorks Online | en | Mathematics software |
| Stuffs on information science and mathematician | ru | Methodical materials |
| Sunburst | en | Training math software on CD: publishers and sellers |
| SunSITE Mathematical Art Gallery | en | Math servers (ftp and gopher) |
| SUNY Binghamton | en | Math servers (ftp and gopher) |
| SUNY Stony Brook Applied Mathematics and Statistics | en | Math servers (ftp and gopher) |
| SUNY Stony Brook | en | Math servers (ftp and gopher) |
| Super Matemбtica | pt | Educational portals |
| superEva - guide di matematica | it | Guides and educational servers |
| superEva - guide di matematica | it | Search engines and links guides |
| SuperKids Educational Software Review | en | Reviews of training programs in math |
| SuperKids Review of Educational Algebra Software | en | Reviews of training programs in math |
| supermatematica | pt | Archives of math programs and training math programs |
| supermatematica | pt | Others links |
| SureMath problem solving software | en | Mathematics software |
| SureMath | en | Sites with math tools |
| Swarthmore Geometry Forum | en | Math servers (ftp and gopher) |
| SymbMath | en | Texts and documents |
| SymbolicNet | en | Math servers (ftp and gopher) |
| SymbolicNet | en | Sites with math tools |
| SYMBOLS.com -- encyclopedia of Western signs and ideograms | en | Encyclopaedia and musea |
| Sу Matemбtica | pt | Educational portals |
| Sуlidos Geomйtricos | pt | Methodical materials |