メールブラックリストテスター
This is to use if you have email deliverability issues.It will check if your IP or domain name is on one or several of online email blacklists (and give you some advises if this is confirmed).
ソーラーパネル計算機
Select you location on a world map, define your solar panels mounting style and orientation, and it will calculate the power produced over the day, month or year. Uses various GIS databases and models.The PVGIS API 5.2 provides programmatic access to the European Commission’s Joint Research Centre solar resource and photovoltaic (PV) performance databases, enabling automated retrieval of high-resolution meteorological and energy data. It delivers granular datasets including hourly solar irradiance, ambient temperature, and wind speed, alongside calculated PV power output for grid-connected and stand-alone systems. The service supports technical workflows through:Typical Meteorological Year (TMY) generation for building and energy simulations.Site-specific horizon profiles to account for topographical shading effects.Performance estimates […]
Netblocksインターネット接続状況日報
NetBlocks is a global internet monitor and watchdog that provides real-time measurement and analysis of internet connectivity, cybersecurity, and digital governance.The platform utilizes a distributed network of probes and advanced data analytics to detect and document internet shutdowns, social media restrictions, and cyberattacks on critical infrastructure. Its primary services include the Internet Observatory, which offers live telemetry on network reachability and routing metrics, and the Cost of Shutdown Tool (COST) -also in our directory-.Tip: this is not exactly an online tool as per other tools in this directory; Netblocks provides one or more daily reports on selected internet connectivity facts on countries around the globe, and as such, is more […]
インターネット遮断ツールのコスト（COST）
The NetBlocks Cost of Shutdown Tool (COST) is a data-driven analytical service that estimates the economic impact of internet disruptions, including total blackouts, mobile data outages, and social media restrictions.By integrating public economic indicators from the World Bank, ITU, and Eurostat with methodologies from the Brookings Institution and CIPESA, the platform generates financial loss projections based on geographic region, disruption type, and duration. It provides a quantitative framework for documenting how digital governance decisions affect national GDP and the broader digital economy.Tip: calculating directly the value for any country, based on the service(s) that would be shut down is an interesting curiosity; seing the chosen methodology and economical hypothesis behind […]
YaCy P2P独自の検索エンジン
YaCy is a decentralized, peer-to-peer (P2P) search engine framework that operates without a central server or governing authority. Each user installs a local node that crawls and indexes web pages, contributing to a distributed global index or maintaining a private, localized index. The service provides a fully open-source (GPL) alternative to centralized search engines, offering features such as intranet indexing, customizable search portals, and a transparent ranking algorithm.By utilizing a P2P architecture, it ensures data privacy, eliminates user tracking, and provides a search environment resistant to external censorship or commercial ranking biases.Nota: we do not list it in the “search” category nor in “resource”, as this is a server-app to […]
ASMインターナショナル出版
An incredibly valuable resource for mechanical engineering.But the ASM Handbooks are not freely available, not even partially. The Digital Library is a paid subscription product.What ASM does offer free is limited:Journals via Subscribe-to-Open (S2O) In 2025 ASM adopted a Subscribe-to-Open model for its 6 primary research journals, meaning articles are published open access if the journal’s sustainability target is met for the year. Octoparse These are research journal articles, not handbook reference data.Periodic free article promotions ASM occasionally opens free access to top downloaded articles from the previous year Apify — but these are time-limited windows, not a permanent free library.Advanced Materials & Processes magazine ASM’s trade magazine has some […]
アボット・エアロスペース技術ライブラリー
The Abbott Aerospace Technical Library provides a centralized repository of over 17,000 technical documents and computational tools for aerospace structural analysis and design. The collection includes digitized NACA, NASA, and ARC reports, alongside proprietary Microsoft Excel spreadsheets for stress analysis and the “Analysis and Design of Composite and Metallic Flight Vehicle Structures” textbook.Key resources available through the service include:Validated structural analysis templates for metallic and composite airframes.Aerospace-specific loads and stress analysis methodologies.Digitized archives of military standards and material handbooks.Manufacturing process specifications and quality system documentation.Engineering and manufacturing professionals can apply these resources to conduct structural validation and ensure regulatory compliance during aircraft development. Stress engineers utilize the library’s computational templates […]
MIL-HDBK-5J 航空宇宙機構造用金属材料および要素
MIL-HDBK-5J Metallic Materials and Elements for Aerospace Vehicle Structures is the free precursor of MMPDS. This is the last DoD-published edition, dated January 31, 2003, superseded by MMPDS-01 but technically equivalent to it. It contains design mechanical and physical properties, joint allowables, and material data coordinated with the Air Force, Army, Navy, and FAA. It’s a ~70MB download.It is a comprehensive engineering reference compiling the mechanical and physical properties of metallic materials used in aerospace and structural applications. Published by the US Department of Defense in its final edition in January 2003, it covers aluminum, steel, titanium, magnesium, and superalloy families, providing statistically derived design allowables (A- and B-basis values), […]
人間工学設計データダイジェスト
The the Reliability, Maintainability, and Supportability (RMS) Guidebook, a technical publication from the Reliability Information Analysis Center (RIAC). It provides a standardized engineering framework for implementing RMS principles across the entire system lifecycle, from initial concept through sustainment.(open the “Open PDF” link to access the full document)The guidebook delivers methodologies for reliability modeling, maintainability predictions, and supportability analysis, serving as a primary reference for Department of Defense (DoD) and industrial engineering standards. It includes specific technical guidance on:Failure Mode, Effects, and Criticality Analysis (FMECA) and Fault Tree Analysis (FTA)Failure Reporting, Analysis, and Corrective Action Systems (FRACAS)Physics-of-failure (PoF) methodologies and reliability growth testingLife cycle cost estimation and maintainability design criteriaFreely downloadable […]
NISTデジタル数学関数ライブラリ（DLMF）
The NIST Digital Library of Mathematical Functions (DLMF) serves as the authoritative, peer-reviewed successor to the Abramowitz and Stegun Handbook of Mathematical Functions. It provides a comprehensive digital repository of mathematical formulas, identities, and properties for special functions used in advanced analysis. The site offers:Rigorous definitions and notations for Bessel, Airy, and hypergeometric functions.Interactive 3D visualizations and downloadable data for analyzing function behavior.Extensive documentation of asymptotic expansions, recurrence relations, and numerical methods.An incredible valuable math resource if not your specialty or rarely use some complex functions … of is years have passed since. The full, and more, content of a commercial expert book, without the price tag.Tip: be ready to […]