在线 CSV 查看器和检查器
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 在线编辑器（及简单的客户端文字处理器）
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 […]
塑料成型及注塑价格计算器
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, […]
GeoGebra 科学计算器
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 […]
免费FEM可安装或在线使用
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 […]
Framacalc 在线协作电子表格
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 […]
MH-Audio 声音和音频计算器（存档）
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 […]
在线整数序列百科全书（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 […]
在线单位转换器
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 […]
Wolfram Alpha 科学参考计算
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 […]