オンラインCSVビューア＆チェッカー
Ever want to see a CSV ? Ever had some quote problem (missing quote or double-quote) and your CSV is corrupted, but you do not know where ? This simple tool helps to visualize these problems without loading bigger tools (MS Excel …). It also permits to export in other formats.
StackEdit Markdownオンラインエディタ（シンプルなクライアントサイドワードプロセッサ）
StackEdit is a sophisticated, open-source Markdown editor designed to provide a professional-grade word processing experience entirely within a web browser. It features a robust toolkit that includesa real-time side-by-side preview,support for LaTeX mathematical expressions,Mermaid diagrams,syntax highlighting for code,making it an ideal choice for both technical documentation and simple online creative writing.The primary benefit of StackEdit is its “local-first” architecture; it performs all text rendering and processing client-side, ensuring that your data remains in the browser’s local storage and is never sent to a server without your explicit command. This combination of high-end typography tools, offline functionality, and a privacy-centric design allows users to create formatted documents without the overhead or […]
プラスチック成形・射出成形価格計算ツール
Great for rapid estimations of the cost of your next plastic injected part. It has a nice database of plastic properties and prices for a first comparison. It takes regrinding, waste, defects, controls and other parameters into account.No rocket science, this is what we used to do in a spreadsheet, but nicely done here already, with convenient tool tips.Note:Use its menu to access a “Featured based” version of the tool, with less technical mandatory parameters and more guidance on long term tool versus rapid cheaper steel tool so as required precision and complexityThis version uses pounds & inches units only (the Featured Based version has metric also)Remember that 80% of […]
GeoGebra科学計算機
Basic but does it well, with history, fractions and all features you want from a scientific calculator: GeoGebra Scientific is a digital computation engine that facilitates high-precision arithmetic and statistical processing through a multi-line input interface. The service provides:Trigonometric, logarithmic, and exponential operators for complex mathematical modeling.Statistical functions including mean and standard deviation for data set characterization.Exact value outputs for fractions and irrational numbers to ensure computational accuracy.A persistent calculation history for auditing and iterative refinement of numerical sequences.It operates as a browser-based and mobile application, offering a consistent environment for technical calculations across diverse hardware configurations. The platform’s support for exact values and complex functional syntax allows for the […]
無料のFEMをインストールまたはオンラインで使用できます
FEM software. Install is normally required (Mac, Windows, Linux) … but an online version is available (look at the right of the top menu): FreeFem finite element software is designed for the numerical solution of partial differential equations (PDEs) in two and three dimensions. It utilizes a high-level domain-specific language that allows users to define variational forms, boundary conditions, and complex geometries without low-level programming.Works with a scripting console, so not very WYSIWYG, but you are always under the control of what is being calculated, and ready for iterations.Source code available, so as an active community for support. The platform provides:Automatic anisotropic mesh adaptation and refinement for localized accuracy.A comprehensive library […]
Framacalc オンライン共同スプレッドシート
Not the most feature-rich spreadsheet, but ZERO install or registration: Framacalc is a collaborative, web-based spreadsheet service hosted by Framasoft and powered by the open-source Ethercalc engine. It provides a platform for multiple users to manipulate data simultaneously in real-time without the requirement of user accounts or local software installation. The service supports standard spreadsheet functionalities, including complex formulas, basic charting, and data persistence via unique URLs. It emphasizes data sovereignty and privacy, offering an open-source alternative to proprietary cloud-based office suites with support for importing and exporting standard file formats like .csv and .ods.You just need to create a random link and just share it to work collaboratively if […]
MH-Audio サウンドおよびオーディオ計算ツール（アーカイブ）
A very good resource for online Audio Calculators, classified into 6 categories:LoudspeakerCrossoverAcousticElectronicTurntableVariousthat really shines in Acoustic and Loudspeaker. The MH-Audio Calculator suite provides an extensive repository of specialized computational tools for electro-acoustics and audio engineering. It facilitates precise modeling of physical sound environments through room mode calculators, absorption coefficient analysis, and reverberation time estimations.Edit: this very valuable site is down for more than 1 year. We provide here the link the the Web Archive. Some calculators are still working, some not. We hope the original site will be back again.The platform includes technical modules for loudspeaker design, such as Thiele/Small parameter analysis, crossover network synthesis, and enclosure volume optimization. Additionally, […]
オンライン整数列百科事典（OEIS）
The largest online integer sequences database, searchable. It provides a searchable interface to identify sequences by numerical terms, keywords, or internal identifiers. Each entry includes technical data such as recurrence relations, generating functions, asymptotic behavior, and cross-references to peer-reviewed literature.The platform also hosts computational scripts in multiple programming languages, enabling the numerical verification and algorithmic extension of sequence data for research and development.Started in 1967 by N.J.A. Sloane, then edited as two books, now is the online version, now featuring more than a quarter of a million sequences.You also have a video illustration of 1000 of these, illustrated by a sequence converted into notes: https://www.youtube.com/watch?v=LCWglXljevYProfessionals in science and engineering utilize the […]
オンライン単位変換ツール
Efficient and well organised (be sure to look at the “by Family” drop-down and not stay at the “Most Popular” selection): ConvertWorld is a centralized calculation engine providing real-time conversion for a comprehensive array of physical units, currencies, and technical metrics. It facilitates precise transformations across categories such as:Mechanical units including torque, pressure, and power.Scientific measurements for radioactivity, magnetic flux, and kinematic viscosity.Information technology metrics for data transfer rates and storage capacity.The platform supports multiple international standards, including SI, Imperial, and US Customary systems, ensuring data consistency across global technical documentation.
Wolfram Alpha Science Reference & 計算科学
Provides engineering information and problem solving techniques and maths, all powered by a powerful search engine: WolframAlpha functions as a computational knowledge engine that generates algorithmic responses by synthesizing structured data from its proprietary knowledge base. It utilizes the Wolfram Language to perform symbolic and numerical computations, providing direct answers rather than a list of external hyperlinks. The platform covers a broad spectrum of technical fields, including advanced mathematics, physics, chemistry, and materials science, offering users precise data points, step-by-step derivations, and dynamic graphical representations of complex functions.By the inventors of Mathematica.Professionals in engineering and science utilize the engine for rapid verification of mathematical models, unit conversions, and the retrieval […]