
StarUML
LucidChart
UMLet
WhiteStarUML
draw.io
PlantUML
yEd
Eclipse Papyrus is an industrial-grade open source Model-Based Engineering tool. Eclipse Papyrus has notably been used successfuly in industrial projects and is the base platform for several industrial modeling tools.

Codechef
LeetCode
HackerRank
Codewars
AlgoExpert.io
Coderbyte
CodeForces
The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.
Which is more popular?
Based on our record, Topcoder seems to be more popular. It has been mentioned 6 times since March 2021.
Website, pricing, platforms and company facts side by side.
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Difference between HackerRank, LeetCode, topcoder and Codeforces
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What are LeetCode and LeetCode alternatives good for?LeetCode💡Interested in leveling up your career? Apply to the Formation Fellowship...
Topcoder is a platform where companies and employers can go to get developers who can work on their projects. The platform offers crowdsourcing services where several developers can work together to complete your task.
TopCoder is one of the original platforms for competitive programming online. It provides a list of algorithmic challenges from the past that you can complete on your own directly online using their code editor. Their...
Recommendations tracked on public social media and blogs since March 2021.


Tracking Eclipse Papyrus since Mar 2021.
TopCoder: Features algorithm and development competitions. - Source: dev.to / about 2 years ago
Leetcode.com for problem solving practice. Do basics first before jumping into this one. Similar thing you can do at topcoder.com for trying to code with a timer. Great for problem solving practice. Source: over 3 years ago
I know topcoder.com does competitive programming for $$, I haven't done it myself though so I'm not entirely sure how it works. Source: over 3 years ago
When comparing Eclipse Papyrus and Topcoder, you can also consider the following products.


CodeChef is a not-for-profit educational initiative by Directi, an Indian software company. It is a global programming community that fosters learning and friendly competition, built on top of the world’s largest competitive programming platform.
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LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Compare LucidChart to Eclipse Papyrus or Topcoder:

Practice and level up your development skills and prepare for technical interviews.
Compare LeetCode to Eclipse Papyrus or Topcoder:


HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Compare HackerRank to Eclipse Papyrus or Topcoder: