Free / Open-sourceSearch and study millions of public SKILL.md agent skills
Free / Open-sourceSearch and study millions of public SKILL.md agent skills
CalcForge records 31,360 monthly visits with -4.8% month-over-month growth and Free, Paid pricing. Models.dev records 200,451 monthly visits with -3.9% growth and Free pricing.
Open-source engineering calculators for civil and structural design
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | calcforge.com | models.dev |
| Pricing Model | Free, Paid | Free |
| Monthly Visits | 31.36K (31,360) | 200.45K (200,451) |
| MoM Traffic Delta | -1.56K (-4.8%) | -8.17K (-3.9%) |
| Primary Market & Share | 🇮🇳 India (16.1%) | 🇨🇳 China (23%) |
| Direct Visits / mo | 12.46K | 136.32K |
| User Rating | 4.3 | 4.4 |
| Supported Platforms | Website | Website |
Open-source engineering calculators for civil and structural design
Structural, geotechnical, tunnelling and contractor tools available free and open source on GitHub.
Searchable construction datasets covering high-rise buildings, bridges, tunnels, dams and housing.
Registered users get calculation workings, bending/shear/deflection diagrams and PDF export.
Four project-based pathways in Python, AI for construction, AI governance and building AI agents.

Open-source database of AI models, prices and capabilities
Every model uses a consistent provider/model format so the same model across providers can be compared directly.
Side-by-side context window, output limit, reasoning, tool calling, structured output, and temperature support.
Input and output prices per million tokens listed alongside release and update dates.
Covers closed flagship APIs and open-weight models from many labs in one sortable catalogue.
Free / Open-sourceSearch and study millions of public SKILL.md agent skills
Free / Open-sourceSearch and study millions of public SKILL.md agent skills
Free / Open-sourceFree practical deep learning courses, research and open-source libraries

SpecialistIncludes model pricing trackers and developer news alongside tools directories, but less focused on raw API specs.
SpecialistIncludes model pricing trackers and developer news alongside tools directories, but less focused on raw API specs.
Free / Open-sourceFree open course for prompt engineering and AI security
Free / Open-sourceFree open course for prompt engineering and AI security

SpecialistIndependently scored open-source alternatives to paid SaaS
SpecialistIndependently scored open-source alternatives to paid SaaS

Courses and best practices for building AI-powered products end to end
Courses and best practices for building AI-powered products end to end
The bug bounty platform built for AI and ML security
The bug bounty platform built for AI and ML security

SpecialistCatalogues and compares AI infrastructure tools and services across categories, but lacks deep per-token pricing tables.
SpecialistCatalogues and compares AI infrastructure tools and services across categories, but lacks deep per-token pricing tables.

Free / Open-sourceOpen AI research for everyone — datasets, models and tools, free for all
Free / Open-sourceOpen AI research for everyone — datasets, models and tools, free for all

Learn AI by building, with a global community of makers
Learn AI by building, with a global community of makers

SpecialistArchives how various AI models answer identical prompts over time, offering qualitative comparison rather than pricing.
SpecialistArchives how various AI models answer identical prompts over time, offering qualitative comparison rather than pricing.

Tracks per-token API prices across major AI providers in a simple comparison table, but omits broader model specs.
Tracks per-token API prices across major AI providers in a simple comparison table, but omits broader model specs.