Qalculate!
Focus: calculator, unit conversion and maths. Shares open source with Ossium. A desktop app, not a website. Adds Windows, Linux and Offline. Rated 4.6 (Ossium: 4.5).
Website
Find open source projects worth contributing to.
Rating
4.5 / 5
Pricing
Free
Difficulty
Beginner
Works on
Web
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
Ossium collects handpicked open-source repositories, good-first issues and GSoC organisations in one place, so you can find something worth contributing to without endless GitHub searching.
Developers and students looking for their first or next open-source contribution.
Maintainers who already know where to contribute.
Not sold on Ossium? These do a similar job, and each card says what it has in common.
Focus: calculator, unit conversion and maths. Shares open source with Ossium. A desktop app, not a website. Adds Windows, Linux and Offline. Rated 4.6 (Ossium: 4.5).
Focus: presentations, decks and slides. Also in Learning and Research, like Ossium. Rated 4.6 (Ossium: 4.5).
Focus: maths, education and worksheets. Also in Learning and Research, like Ossium. Rated 4.6 (Ossium: 4.5).
Focus: app store, screenshots and design inspiration. Also in Learning and Research, like Ossium. Same 4.5 rating.
Focus: tool reviews, recommendations and directory. Also in Research and Learning, like Ossium. Same 4.5 rating.
Focus: design inspiration, ui design and motion design. Also in Learning and Research, like Ossium. Same 4.5 rating.
Want to spend nothing? These free picks cover similar ground.
Focus: design resources, directory and ui kits. Also in Learning and Research, like Ossium. Same 4.5 rating.
Focus: uses pages, developer setup and tools. Also in Research and Personal Productivity, like Ossium. Same 4.5 rating.
Focus: fonts, typography and design. Also in Learning and Research, like Ossium. Rated 4.4 (Ossium: 4.5).
Focus: design education, principles and tips. Also in Learning and Research, like Ossium. Rated 4.3 (Ossium: 4.5).
Focus: logo, branding and identity. Also in Learning and Research, like Ossium. Rated 4.3 (Ossium: 4.5).
Focus: cybersecurity, projects and portfolio. Also in Learning and Research, like Ossium. A course, not a website. Rated 4.8 (Ossium: 4.5).
Free Notion database
Real online businesses, creators and projects, broken down by how they make money: apps, online stores, AI tools and more. Free on Gumroad.
Get the free databaseFree Notion database
Hundreds of online income methods in one place, so you can compare options and pick one to try. Free on Gumroad.
Get the free listFor research and ideas only. Results vary and nothing here is a promise of income. See our Disclaimer.
Weekly newsletter
One short email every Monday with everything shipped that week: new free tools and websites, new guides, new free browser tools and what's new in my free Gumroad libraries, plus how the site is growing. Free, and you can unsubscribe anytime.
Join the newsletterYou sign up on Gumroad, which stores your email to send the newsletter. See our Privacy Policy.