Find the best freelance websites, gig platforms, and marketplaces.
Open platforms where anyone can register to work or hire — freelance sites like Upwork, ride platforms like Uber, and more. Vetted networks are included and marked. Browse with filters, discover with AI, see curated lists, or submit a site.
26 platforms found · Clear filters
A pentest-as-a-service platform whose vetted Cobalt Core community of pentesters earns from structured engagements rather than open bounties…
cobalt.io26 viewsA vetted security testing platform whose Red Team accepts researchers only after skills assessment and background checks. Members get steady…
synack.com25 viewsPays open source maintainers (as lifters) for keeping packages secure and well-maintained, funded by enterprise subscriptions.
tidelift.com19 viewsAn open AI challenge platform hosting research competitions with prizes, often in reinforcement learning and applied ML.
aicrowd.com22 viewsA crowdsourced security platform running bug bounty and vulnerability disclosure programs. Researchers earn cash for valid findings, ranked…
bugcrowd.com23 viewsThe largest hackathon platform - find online and in-person hackathons with cash prizes across every theme and skill level.
devpost.com24 viewsData science competitions with social impact - solve problems for nonprofits and public agencies with cash prizes.
drivendata.org22 viewsSponsorship directly inside GitHub - developers and organizations fund your open source work monthly or one-time, with no platform fee on pe…
github.com26 viewsA bug bounty platform from the Hacken security ecosystem, focused on web3 and crypto projects with public and private programs.
hackenproof.com19 viewsA platform hosting coding challenges and hackathons with cash prizes and hiring contests.
hackerearth.com21 viewsThe largest bug bounty platform, where security researchers report vulnerabilities to companies and earn bounties. Open sign-up, with invita…
hackerone.com25 viewsA crowdsourced innovation platform where organizations post prize challenges open to anyone, from engineering to naming contests.
herox.com23 viewsThe leading bug bounty platform for web3 and smart contracts, known for some of the largest payouts in security - top bounties run into the…
immunefi.com20 viewsA European bug bounty platform connecting ethical hackers with companies across the continent and beyond. Known for community events and fas…
intigriti.com27 viewsThe home of data science competitions, owned by Google - prize pools regularly reach tens of thousands of dollars, plus community hackathons…
kaggle.com20 viewsA non-profit platform for recurrent donations to creators and maintainers - no platform fee, only payment processing costs.
liberapay.com21 viewsAn Indian ML competition platform with hackathons and hiring challenges from data-driven companies.
machinehack.com19 viewsA non-profit, open platform for responsible disclosure of website vulnerabilities. Researchers report issues and site owners may reward them…
openbugbounty.org20 viewsTransparent funding for open source projects and communities - collect sponsorships and donations, spend with full public accounting.
opencollective.com24 viewsA funding and monetization platform for developers - sell licenses, subscriptions, and digital products on top of open source, acting as mer…
polar.sh21 viewsThe original competitive programming and crowdsourced development platform, paying members for design, development, and data science challen…
topcoder.com67 viewsIndia largest competitions and hackathons platform for students and professionals, with cash prizes and hiring challenges.
unstop.com23 viewsThe challenge network formerly known as InnoCentive, paying solvers for breakthrough solutions to R&D and innovation problems.
wazoku.com16 viewsA French bug bounty platform serving European enterprises and public institutions. Researchers worldwide hunt on public and private programs…
yeswehack.com21 viewsA Dutch security platform running bug bounty and coordinated vulnerability disclosure programs with a community of invited researchers.
zerocopter.com34 viewsAfrica data science competition platform, connecting African data scientists with paid challenges from companies and NGOs.
zindi.africa24 views