These software development companies in Yvelines include a large group, Dassault Systèmes, alongside many mid-sized firms. Their activities span a wide range of specialized software solutions, from product lifecycle management to business intelligence and mobile app development. Companies like SELL focus on optimizing sales strategies with cloud platforms, while 4D offers a low-code development platform. Médiane Système specializes in embedded AI and cybersecurity, and 6WIND provides cloud networking software.
A notable pattern among these companies is their geographical concentration. Several companies, including 4D, Médiane Système, and Siveco Group, are headquartered in Le Pecq and Montigny-le-Bretonneux. There is also a cluster in Versailles with companies such as SQI, COSIUM, and EURODECISION - Groupe DecideOm.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Dassault Systèmes3ds.com
Pioneering virtual worlds since 1981, this company offers a platform enabling customers across industries to collaborate, imagine, and create sustainable innovations for real-life impact. |
27,414 | |||
| 2 |
SELLsell-marketing.com
A French independent company helps businesses master product information to optimize their sales strategy using the SELL BASE cloud platform |
587 | |||
| 3 | 405 | ||||
| 4 |
Médiane Systèmemedianesysteme.com
Specializes in custom secure real-time operating systems, private 5G networks, embedded AI, cybersecurity, and industrial network solutions. |
213 | |||
| 5 | 110 | ||||
| 6 |
Siveco Groupsiveco.com
A global leader in CMMS software, with over 37 years of experience in project management, serving clients in over 60 countries |
107 | |||
| 7 | 106 | ||||
| 8 |
Avanteamavanteam.fr
A software editor specializing in BPM and ECM solutions, using innovative technologies like AI, serving over 500 customers in Europe |
104 | |||
| 9 |
4DConcept4dconcept.fr
Specializing in content and editorial engineering, 4D CONCEPT provides tailored solutions for digital content production, publishing, archiving across various industries |
74 | |||
| 10 |
COSIUMcosium.com
Cloud-based software and hardware solutions for healthcare industry, offering ICT outsourcing, Business Intelligence tools, and custom-designed electronics for optical retail and domiciliary care |
65 | |||
| 11 |
Coptiscoptis.com
A company specializing in advanced technology solutions for Cosmetic R&D, offering software for product development, compliance management, and toxicology information |
58 | |||
| 12 | 53 | ||||
| 13 |
EURODECISION - Groupe DecideOmeurodecision.com
Specializing in business analytics, EURODECISION helps teams make optimal decisions by analyzing data and offering customized solutions using mathematical algorithms and AI |
50 | |||
| 14 |
OSE Engineeringose-engineering.fr
Developing innovative software and technologies focused on improving work experiences through quality, customer-centric solutions and continuous innovation. |
49 | |||
| 15 |
Pomelo-Paradigmpomelo-paradigm.com
An innovative company designing collaborative applications with simple tools to enhance human productivity across all media platforms |
47 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Allshareallshare.fr
Helps HR, C&B, and Finance teams align workforce with company strategy and build compensation policies to attract, retain, and engage employees. |
46 | |||
| 17 |
PHOENIX FLEET EXPERTphoenix-fleetexpert.com
PHOENIX FLEET EXPERT offers fleet management solutions including outsourcing, software, and shared management to optimize clients' vehicle fleets effectively |
45 | |||
| 18 |
InSitutranstechnology.fr
A French company developing and selling user-friendly sales software for space design professionals, offering personalized solutions and attentive customer service |
40 | |||
| 19 |
Veryswingveryswing.com
French editor providing SaaS management software for IT services, consulting firms, design offices, and umbrella companies, ensuring high security and regulatory compliance. |
36 | |||
| 20 |
MédiFirstmedifirst.com
Dedicated to serving medical professionals in Assisted Reproduction (ART) and Genetics, the company provides an EMR system to streamline patient journeys and boost operational efficiency. |
32 | |||
| 21 |
MonEcho - logiciel médicalmonecho.com
Provides an online software solution for ultrasound practitioners and hospitals, integrating with all ultrasound machines and ensuring data security and efficient workflow. |
25 | |||
| 22 |
EVOGEST LOGESTevogest.fr
EVOGEST is your partner for integrated ERP solutions and computer hardware in Orgeval, France, specializing in business management and IT equipment |
24 | |||
| 23 |
APSYS Business Partner | Rydge Conseilapsys.fr
Integration of management software solutions for French SMEs, offering consulting, deployment, project management, and ongoing support services. |
21 | |||
| 24 |
SUNERIS SOLUTIONsuneris.com
Develops, manufactures, and markets telecom software and hardware solutions for supervision, analysis, optimization, and security of telecommunication networks. |
20 | |||
| 25 |
MAIDIS SASmaidis.fr
Development and marketing of comprehensive electronic health record software for medical and dental practices, hospitals, and health centers. |
19 | |||
| 26 |
Gestimumgestimum.com
Manufacturer of user-friendly ERP software, Gestimum, tailored for 20-500 employee companies Constantly updates with new features and offers related services |
19 | |||
| 27 |
KERLOGkerlog.com
Software publisher specializing in waste management for environmental and recycling industries, serving over 350 clients with 4,000+ users across France and overseas territories |
19 | |||
| 28 |
ID Infos
A software integration expert since 1984, specializing in Sage and EBP, offering expert technical solutions with a personalized and human touch for clients |
18 | |||
| 29 |
CASYOPE Servicescasyope.fr
Specializes in digital transformation through monetary services, dematerialization, development, and personalized client support with skilled technicians and developers. |
18 | |||
| 30 |
NET POINTnetpoint.fr
Aggregation of SaaS, IaaS, and PaaS solutions from multiple vendors through a cloud marketplace platform named Provicloud. |
17 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
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